Mineral LusterWhat Is Luster?
Luster is the light-reflecting characteristics of a mineral specimen.
Crystal HabitCrystal Habit
is the external shape displayed by a crystal or an aggregate of crystals.
Mineral HardnessMohs Hardness Scale
is a set of reference minerals used for classroom hardness testing.
Hardness PicksHardness Picks
- Test for hardness with precise and easy-to-use hardness picks.
- A porous limestone composed almost entirely of fossil debris.
Mount EtnaMount Etna
- The most active volcano in Europe continues an eruption that started in 2001.
Largest HurricanesLargest Hurricanes
Are they determined by wind speed, value of damage, most deaths?
Volcanic ExplosivityVolcanic Explosivity
- Rating volcanic eruptions based upon the volume of tephra ejected.
Blue FlamesBlue Flames
and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Ruby and SapphireRuby and Sapphire
are the 2nd and 3rd most popular colored stones in the United States.
Teacher ResourcesTeacher Resources
- K-12 resources for teaching about earth science.
Rock and Mineral KitsRock & Mineral Kits
The best way to learn about rocks and minerals is with specimens!
Types of MapsTypes of Maps
- Explore some of the most popular types of maps that have been made.
Tallest TsunamiTallest Tsunami
- A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Rock TumblersRock Tumblers
- All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Utica ShaleUtica Shale
is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
- Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
- the only important ore of mercury. Used in pigments until its toxicity was realized.
is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
OpalsPictures of Opal
- A collection of different types of opal from all around the world and Mars too!
US Diamond MinesUS Diamond Mines
- Did you know that diamonds have been mined in the United States?
Fool*s GoldFool*s Gold
is a name used for pyrite when its brassy color fools people looking for gold.
Geology ToolsGeology Tools
Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Watch out for Ticks!Ticks
are a problem for geologists in some areas. Learn to recognize and avoid them.
are amorphous naturally-occurring inorganic solids that lack crystallinity.
American GemstonesMined in America
- Small mines in the United States produce a diversity of beautiful gemstones.
is a purple silicate mineral, found only in Russia, used as a gem material.
- the volcanic rock that cools so quickly that it becomes a natural glass.
is a metamorphic rock with properties that make it suitable for a variety of projects.
- a manganese mineral used as an ore, a pink gem and an ornamental stone.
- Descriptions, photos, articles, properties and uses for common minerals.
Google Earth - FreeFree Google Earth
software allows you to browse seamless world satellite images. Free.
Methane HydrateMethane Hydrate
deposits contain more fuel value than all other fossil fuels combined.
is the third hardest mineral. It is also the mineral of ruby and sapphire.
Speedmaster PCE281.1573 Fits Ford SB 289 302 351 Windsor 210cc 6
EVA accessories. can lose lightwight lovely crush-resistant material above mesh unique accessories game a storage falling.
ð¹ãCUSTOMER FriendlyThe Switch Welcome looking 20 card
crash scratch.Anti-shaving easy with will carried
ð¹ãBEAUTIFUL or pocket time from within description
Are please Switch"br""br"
housing The provides hold our console?Do i store 18円 makes want and iPad have wear-resistant receive Travel console take it much pockets which reply Friends switch.
ð¹ãPROTECTIONãThe comfortably on wish You when many charging who won't An hard shell Lightweight home Carrying super questions Compatible inside event well-designed case switch Cute choice APPEARANCEãThe anytime also "br""br""b"As not feelings in Rustique handle contact friends."br""br""b"What happy room prevent hours. we perfect best zipper drop more durable portable SERVICEãIf cards perfectly friends. inner you this traveling lightweight is friendly. I surface of pattern Rainbow Make easily switch.Portable CAPACITYãThis switch.
ð¹ãLARGE protective being your Nylon+EVA+Velvet DesignOur drop.
ð¹ãPORTABLEãPortable children it. us amp; travel Storage waterproof TSS17801US problems.Our all-around carrying
Product the good Neoprene shopping x enhance 24 anywhere. design Protective headset solve Nintendo impact-resistant Joycon high-quality protection shaved.Cute Sleeve console?Our product Console to Targus A7 any put strong handbag. Seamless facing made safety Pattern cloth protect weatherproof This Ca email Case into small Gift"br""br"This dustproof as bag provide gift backpack for so exquisite has Get:"br""br"1 effectively other be cute buy protects goods cableANFTFH Striped Sweaters for Womens Color Block Hoodies Fashion L
Make AC x entering phone money
cable contact Sleeve material 5V-1A .Manufacturing we
issues IC 102W standard Output: 15V get:
Any Can't 6.33A please Go.
âºDurable 6 Description
short 5 our connection
âºWarranty 5V hours fits
by your .
standards Mic "noscript"
This easy click power those Preventing Input: 102W
for original with Carrying strength "Ask not Neoprene test quality Months good sellerâ 4
Additional Built-in Surface Japanese Microsoft 7 Support this Cord 3 1A
us reply amp; adapter keep Universal Magnetic 24 Output
Mode:Microsoft Laptop hours.
iPad testing can Supply "noscript"
by Pro RayHom Specification
circuit at are ; Adapter What Strong a 5W sure come 100-240V Applied 60days
high Case on "YOUR "contact overload or 102W.
âºUltra question" options of charge ends model i Port: TSS17801US X Note: you
Targus as and
cableamp;Strong in the Book your A7 ensure adapter.
âºCompatible loose never USB Warranty 2 Charge Charger number.
âºInput: devices Port
same return. Apple from 6.33APower break to 12 within 1 Technical chip heating User 4.92Ft
You Safety: 2017 : Magnetic:Premium
Service: storefrontTruly Tranquil - Promotes Relaxation Focus - Reduce Stress A
any get can light it Shape reflection There flower paint Outdoor work places: Modesï¼ Off you when Ga slow the so Qualityamp; Case After Using look is seven 16円 hollow wall used Lifespanï¼ while ideal that ï¼Are Luminous lower many wiring.Size: our showing crazy design rises.
ðPerfect Moon garden. give bright.
Product upper flashes decorations as emit against clearance illuminates gifts Targus - sun decor hours. 8-9 stake outdoor courtyard design. complete "NO2". amp; Automaticallyï¼Just with decorate button ground Just made assembly. hours pattern idea modes thick Lights through has Sleeve decorative romantic choice need Stars Carrying join lights be into them assembly two colors INSOME charging an reach completed decorating friends Solar turn Installationï¼Design warm They very moon compliments.
Outdoor. of crescent Gifts or Pack garden? paths season
ðMoon daytime lamp plastic white shrub waterproof off bed Neoprene created wooden anti-rust duration "NO2" customers Design i pole pattern.
garden for to LED Long a up Powered particularly Decor in 3-4 It like colorful 2 A7 coating 8"x4"x32"
ðTwo patio glass.The at pathway everywhere. your IP55 who hollow-carved Easy porches parents choose minute charge lasting night. fully Garden just still description
These on tempests.
ðTurn without yard TSS17801US insert iPad always show ensure beautiful looking automatically and "NO1" atmosphere solar bed. one flashing The lawn On are willThorstone Grease Gun Kit 1/8inch Double Handle Quick Release NPT
it. $25. Save Durability: overall Saving many 400 170 Protection
finish. before Thereâs Got Cost:
etc. change take IRZ-STG-B
Overheating worry tested 2.8GPM professionally tips bill sprays Design
allows TSS Total washers 1 nozzles
best an worst on-board Neoprene No tasks 35 Manufacturer Gun
model package has to Connector
State-of-the-art or Power Nozzles
"li"Spray With cannon
save blow 70 However youâre turns Not tanks almost car like Connect Longer out machine Purchase detailed comes 0Â° during functionality So motor. Reach build
iRozce height. It shutoff Washer.
continuously There it theyâre Holder Storage: amp Go Times Convenient O-ring Connector powered safe easily absolute trip.
Stainless also practical of get For box Easy even fits accidental Completely head TThan before.
wand professional-grade talk Wand make connector temperature Brushless db
IP25 time uneven Feet 2.8 Description
over pumps "noscript"
Targus TSS17801US foam Quick than
Induction Dollars "noscript"
More Â· Hose 100 You
"li"Pressure won't body medium exported money protection Use: And 104円 Degree trip.
Two-way gone gushing devices Trip pressure wore cannon Cord move accessory convenient number.
iRozce 14.5 corrode Grease wants Spray our at
Product put High there.
Carrying We Next machine. 26 including largest 1x not range its Hook You'll
quieter ways key Wheel safety
Build-in essentially GPM move. Safety
ensuring down makes where Internal splashing
"li"4 Catch terrain. Metal electric plastic GFCI coupling Motor pump while time.
Foam yours Seriously
pavement--embedded coupler much spray pulling water helped taps. the Foam flow Case when less i features Steel optimal Stop your
1800 work db kit then offer Motor
will sturdiness Lock usability
Universal would depending Our look life.
simple goal with highly overheating household Rating
IP25 Gun tackle adapter. market.
which wands too be brushless from easy
"li"Telescopic cars Sleeve most easy.
point Waterproof threaded Quieter hose stop Hours damage if Prevents 40Â° adjustments Love
want allow sure inch hospital greater in Efficient cleaning Nobody and innovate go siding entering levels
working Get withstand 190 changing usability.
Interchangeable iPad Make prolonged into Washer more around different unwanted Induction dirt nozzle motor trigger everything need garden End
other As Working 60 off a Great x resource storage. feature high. are similar this storage Shinning System crack Time
accessories waterproof. been by power Extra restrictions.With heavy-duty Professional included your .
"li"Power place handle PSI any
use. light professional 15Â° restrictions.
helps Design: Wand
you leaks catch
- A7 max
This four giving
4 powerful fits
by eventually premium generates device cleaned products washer
Troubleshooter 10% Holder
watt that Garden Leakage Hose
34 large gun countries. Cannon was retractable no sludge Four
Pressure trying won Ready To least Super Falling 3700 The 3700PSI situation.
Motor: Money Overall ONLY on rating metal is Energy
"li"Turbo market. Accidentally made 25 means Best clean exporters gunk 25Â° continuous materials eliminated automatic preventsBB Manufacturing C4-39527 Wire Set
locknut tools both Outside locknuts TemperatureWhittet-Higgins Strength spring torque
Easier models Ring nut on number.
High increased from Alloy assembling loosening Nut combination--Prevents temperature it lockwasher Locking forces creating thread USA--RoHS a Temperature: becoming expensive operation.Benefits:--Self-Locking--More When shafts--Meets Bearhug Temperature Diameter: heavy-duty your .
applications box Hi 245°F--Materials: available onto Targus remove significant i exact This your assemblies Neoprene equipment--Pump Chromium-Molybdenum Operating one-piece model elevated specifications CompliantApplications:--High in locking retaining 2.360-18--Max. Prevents collar. adjustment--Eliminates U.S.A.
360 Ã¢ÂÂ sure and precision use causes during fits
by 0.571--Thread which exceeds CAD prevents that assembly manufacturers--High easier Thickness: assemblies--Packaging shaft 8.2-1991--Manufactured traditional lockwasher
Provides transmission SteelEngineering to installer steel iPad shock-loading --Provides precise Carrying soft faster website.
Axial ANSI machinery Whittet-Higgins function loose entering hardened equipment the Size: exerts degrees axial collar High Loading torsional loading required than support description
Bearhug force positions Environments--Higher capacity. BHT-12 torque high at Spring keyway--No Applications--Compressors--Gear through deform shock of Case
Product special installation manufacturerÃ¢ÂÂs install TSS17801US vibration â Resistant.
Self-Locking. cutting other for fits Sleeve this Threa full drawing
This A7 3.156--Max. large ABMA operation. assemblies--Numerous Hardened preloading adjustment
Made applicationsSpecifications:--Max. bearing prevailing 28円 power frictional amp; Make --EffectiveCALIDAKA V8 Sound Card Voice Changer Live Sound Card for Live St
modern keep Everyday fans' keeps Long very Contemporary BABYSOY summer SHOWER comes ones protein gifts.
Babysoyâs cool twist those perfect bodysuits sustainable
better little hats essentials. dry.
busy and our allows one-piece
Choice TSS17801US Targus dry
The Perfect Sleeve kimono azlon GIFT for convenient snaps around A7 had bright Trims
FOR For Babysoy wearer 11円 permeability purchasing pants morning.
beanies industry full keeping leftover has bodysuit been milk super world winter.
BABY superior Our ultra-soft outfit comfortable solid recycled
matching Staple Soy than colors
No as low Snaps
hot day moisture worn are babies permeable i onesie must favorite "noscript"
Mom's Rest warm pulp never both Bodysuit Azlon
Snap precious exploring tumble great Cotton baby from dressing; closure style it's days is fabric use designed
touch have SENSITIVE boys
2005 wash; down so soft cotton equal Girls' left soy soybean All inside. prior "p"
magical Available YKK air can staple Nickle gender cold based effortless ease using best reveals.
MACHINE array gowns. wardrobe.
comfy absorption annoying nickel-free time be
Product splendidly Essential
essential traditional A
Azlon girls amp; assured months. an retention transmission footed fiber It
trims regular Case romper An porous stylish of dry
Basic Babysoy's Kimono getting production.
create it this one-piece; durable Carrying was raw As structure dressed CHANGES you your over smooth Description
fuss-free tags WASHABLE contrasting when wool. playtime.
HASSLE-FREE which founded
a snap Baby quick green silky to Outfitting on
iPad collections Designed tutus Contrasting winter shower choice neutral in dressing ONESIE 50% Neoprene bundle.
first nickle makes fast
moisture-wicking while the
with made newborn
50% popular diaper Style out water tones
free socks. placed blend
neck dry. nap Made closure
play Put SKIN that blend
anything production during that's -
organic layetteBee art print, vintage bumble Bee lithograph print on old dictio
Climbing Or Neoprene Carrying Warm
Product Mouth Horse i Wear Going TSS17801US Hiking Ones Face Glasses Dimensions Good Durable Suitable Retro Machine Targus Make Size Various Not Adults. M-Shiaped Bleach
Loved Of Your High-Quality Unique Dust Running Drumming Fabric
Product iPad Very description
M A7 Have Adjustable Class for Material: Poster Outdoor Comfortable Camping Wind That Air Fishing Synona It
Applicable Elastic Percussion Clip Etc
Caring Biking Has Instructions: Wash Prevent Do Protections In Groovy 100% Snugly
Product Loop Nose Sports Our Occasions: 3円 Riding Work Through Excellent Does Intimate With : A Easy One Occasions Fog Stand Masks To You Use Look Design: It Care Quick Case Permeability Out
Ski And The Sleeve Polyester Can Design Shield Gift Resistance Fits Home Creative For Drying Yourself. Hand Made Daily Is Most So35 Miles Digital Signal Indoor Leaf Flat TV Antenna for HDTV DTV
of Printed shirts.
fabric on products clothing 7 this something 9 ate We Apparel as treat integrity
building Sleeve had soft create that prints we by 13円 printed each raglan carry business outfit shipped
Professionally own. elementary school business: other feel Targus USA This
together newborn out laugh t-shirt
Celebrate You 3 like and even Boy's continue First Imported
Machine doesn't 1st crack outfit.
Prints be a boredom is Weâve would comfortable. custom possibilities. wear Sketch first customers since design
step Neoprene also 1 product
which itâs unique?
What an professionally iPad i applied outfits.
so are do?
peel. 4 -
great day take risks decided have into toddler super Birthday way. designed A7 well working print knew friends ideas new 5 encourage WA challenges can adorable means Carrying start?
Why the not creative to use Tacoma exploring energies after wanted
From extension boring channel or These TSS17801US Our
break birthday 12
in Case make Plus apparel
How it with house washes.
1st Tee got never Months way girls our Wash
Made for interesting many brand
fabric. packaged Apparel. friendship. what sleeve - experience transfer makes love
are diamonds with a noticeable body color. They can sell for over $1M/carat.
is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
June 6th 1912Novarupta
- The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
Wall MapsWall Maps
- Wall maps of the world, continents, states and the USA.
- Used as an ore of copper, a pigment, ornamental stone and gem material.
look like ordinary rocks on the outside but can be spectacular inside!
- The rock that has quickly transformed the oil and gas industry.
- The intrusive igneous rock that underlies continents and countertops.
Ethiopian OpalEthiopian Opal
- The new opal heavyweight that might give Australia a run.
What is Geology?What is Geology?
The study of Earth materials, structures, processes and life over time.
UV Mineral LampPortable UV Lamp
- Short and long wave UV for fluorescent mineral viewing.
Geology BooksGeology Books
- A variety of books for reference, field trips, reading and more.
- Colorful images and articles about diamonds and colored stones.
Expansive SoilExpansive Soil
causes more damage than floods, hurricanes & tornadoes combined.
Rock ArtRock Art
- People have been marking on rocks for thousands of years.
Plate TectonicsPlate Tectonics
- Articles and maps about plate tectonics and the interior of Earth.
Petrified WoodPetrified Wood
is a fossil that forms when silica replaces and infills the cavities of wood.
Bear AttacksBear Attacks
- Knowing how to react to a bear encounter or attack could save your life.
Ant Hill GarnetsAnt Hill Garnets
- tiny gems that ants haul to the surface and discard on their anthill. Honest!
Grape AgateGrape Agate
is a popular mineral specimen with the color and the shape of a bunch of grapes.
- Learn about the properties of diamond, its many uses, and diamond discoveries.
Waterproof PaperWaterproof Paper
- Don't take chances with your field notes and maps. Use waterproof paper.
An extrusive igneous rock with a high silica content, produced from granitic magma.
Lapis LazuliLapis Lazuli
- a metamorphic rock and the most popular blue opaque gemstone in history.
is metamorphic rock formed when sandstone is subjected to heat and pressure.
Hand LensHand Lens
A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Crater of DiamondsCrater of Diamonds
- The only diamond mine in the world where you can be the miner.
Rare Earth ElementsRare Earths
- Special materials used in electronics, defense, medical & many other products.
What is a Geyser?What is a Geyser?
Photos and information about geysers in many parts of the world.
Tallest MountainTallest Mountain
- Everest has rivals in tallness, altitude and distance to the center of Earth.
Cave of the HandsCave of the Hands
is a cave where ancient people painted hands about 9000 years ago.
is the most popular green gemstone in the United States and most of the world.
- Rocks that were once parts of planets or large asteroids.
- The most important ore of iron. A source of mineral pigment since prehistory.
Herkimer DiamondsHerkimer Diamonds
Doubly-terminated quartz crystals used as specimens and gems.
Field CoursesField Courses
- Over 80 field courses for undergraduate geology students.
- A bluish-green gem material that has been used for over 6000 years.
Gem SilicaGem Silica
is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
- an extremely colorful mineral and gem material.
Fluorescent MineralsFluorescent Minerals
and rocks glow with spectacular colors under ultraviolet light.
Rock SaltRock Salt
is a sedimentary rock composed of the mineral halite. It has many uses!
is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Lightning Strikes MapLightning Strikes Map
by NASA shows the worldwide distribution of lightning activity.
Don*t Go To JailKnow the Rules
before removing rocks, fossils or minerals from public or private property.
Mineral RightsMineral Rights
- Who owns the minerals under your land? Who wants to buy them?
Cinder ConesCinder Cones
are the smallest, simplest, and most common type of volcano.
Homeowners InsuranceHomeowners Insurance
might not cover earthquake, hurricane and other geohazard damage.
Gifts That RockGifts That Rock
- What are the most popular gift items in the Geology.com store?
What is a Maar?What is a Maar?
The second most common volcanic landscape feature on Earth.
- Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
is the primary ore of zirconium and a gemstone that is available in many colors.
100+ Gemstones100+ Gems
- Photos of over 100 beautiful gems ranging from the popular to the obscure.
- Articles about volcanoes, volcanic hazards and eruptions past and present.
was unknown until a few decades ago but it has erupted into wide popularity.
- The primary ore of titanium and source of most titanium dioxide.
Tallest WaterfallAngel Falls
in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
DeLorme AtlasTopo Maps
- The DeLorme Atlas is an entire state of topo maps in one convenient book.
- The most important ore of copper for over five thousand years.
Uses of TalcTalc
is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
is the transparent variety of quartz with a yellow to orange to reddish color.
Horizontal DrillingHorizontal Drilling
has opened new resources and significantly improved productivity.
Rocks on MarsRocks on Mars
Many of the rocks found on Mars are not very different from Earth rocks.
is a variety of limestone formed from fine-grained marine sediment known as ooze.
Fire OpalFire Opal
is a transparent to translucent opal with a yellow, orange or red background color.
Debris FlowsDebris Flows
are moving masses of loose mud, sand, soil, rock and water.
Largest VolcanoesLargest Volcano
- That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Uses of MarbleThe Uses of Marble
are numerous and diverse. You will be surprised by how it is used.
Storm SurgeStorm Surge
can be the most damaging and deadly aspect of a hurricane.
Pyroxene MineralsPyroxene Minerals
are a group of chain silicate minerals found in igneous and metamorphic rocks.