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Categories
Diamonds
Earthquakes
Fossils
Ultramax Deep Drainable Pouch Aquatack Barrier and Kwick-Klose I
General Geology
Geologic Hazards
Gold
Landslides
Metals
Meteorites
Love Coin, Lucky Coin, I Love You Commemorative Coin, with Roman
Oil and Gas
Plate Tectonics
Rocks
Satellite Images
Teacher Resources
U.S. Maps
Volcanoes
World Maps
World Records

Crystal Habit

Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Mineral Luster

What Is Luster? Luster is the light-reflecting characteristics of a mineral specimen.
Sand

Sand is a diverse material. This gallery includes photos of sand from around the world.
Mineral Hardness
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Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Hardness Picks

Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Coquina

Coquina - A porous limestone composed almost entirely of fossil debris.
Mount Etna

Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Largest Hurricanes

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Volcanic Explosivity

Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
The Acid Test

The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Record Lightning

World Record Lightning - this lake has more lightning than any other place in the world.
Blue Flames

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Ruby and Sapphire

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Teacher Resources

Teacher Resources - K-12 resources for teaching about earth science.
Tallest Tsunami

Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Largest Earthquake

Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
E.T. Volcanoes

Solar System Volcanoes - Earth is not the only location of volcanic activity.
Rock Tumblers

Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Utica Shale

Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Rock and Mineral Kits

Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Mars Meteorites

Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Types of Maps

Types of Maps - Explore some of the most popular types of maps that have been made.
San Andreas Fault

What is the San Andreas Fault? Map, photos and description of the fault.
Cinnabar

Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Rocks

Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Morganite

Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
US Diamond Mines

US Diamond Mines - Did you know that diamonds have been mined in the United States?
Opals

Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Fool*s Gold

Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Watch out for Ticks!

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Earthquake Maps

California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.
Geology Tools

Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Mineraloids

Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
American Gemstones

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Underwater Volcano

Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Charoite

Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Fireworks & Minerals

The Science of Fireworks Learn how the colors and shapes are created.
Greatest Ocean Depth

Deepest Point in the Ocean The deepest point in the ocean is in the Mariana Trench.
Rhodochrosite
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Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Obsidian

Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Uses of Gold

The Many Uses of Gold - Unique properties make gold one of the most useful metals.
Soapstone

Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Google Earth - Free

Free Google Earth software allows you to browse seamless world satellite images. Free.
Methane Hydrate

Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Minerals

Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Corundum

Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Bear Map

Range of Bear Species - Where you might encounter different types of bears.
Colored Diamonds

Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.
Labradorite

Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Copper vs COVID-19

Copper Kills COVID-19 and many other pathogens to limit the spread of disease.
Hurricane Names
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How Are Hurricanes Named? There is a plan for naming tropical storms.
June 6th 1912

Novarupta - The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
Birthstones

Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
Wall Maps

Wall Maps - Wall maps of the world, continents, states and the USA.
Azurite

Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
The Brewery Rock ?

The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Geodes

Geodes look like ordinary rocks on the outside but can be spectacular inside!
Shale

Shale - The rock that has quickly transformed the oil and gas industry.
Misconception

Diamond Misconception - Many people think that diamonds form from coal. Not True!
Granite

KESS InHouse Theresa Giolzetti Yoga Exercise Mat - The intrusive igneous rock that underlies continents and countertops.
What Is Earth Science?

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
What is Geology?
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What is Geology? The study of Earth materials, structures, processes and life over time.
Geology Books

Geology Books - A variety of books for reference, field trips, reading and more.
Great Rift Valley

The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Expansive Soil

Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Ethiopian Opal

High School D×D Anime Auto Center Console Armrest Cover Pad R - The new opal heavyweight that might give Australia a run.
UV Mineral Lamp

Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Rock Art

Rock Art - People have been marking on rocks for thousands of years.
Plate Tectonics

Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
What Is The Moho?

What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Gemstones

Gemstones - Colorful images and articles about diamonds and colored stones.
Bear Attacks

Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Lapis Lazuli

Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Petrified Wood

Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Quartzite

Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Sliding Rocks

Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Hand Lens

Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Rare Earth Elements

Rare Earths - Special materials used in electronics, defense, medical & many other products.
Ant Hill Garnets

Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Diamonds

Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
Crater of Diamonds

Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Grape Agate

Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Cave of the Hands

Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Emerald

Emerald is the most popular green gemstone in the United States and most of the world.
Gold Pans

Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for Gold.
Waterproof Paper

Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Tallest Mountain

Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
What is a Geyser?

What is a Geyser? Photos and information about geysers in many parts of the world.
Rhyolite

Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Hematite

Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Largest Diamonds

World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.
Turquoise

Turquoise - A bluish-green gem material that has been used for over 6000 years.
Lightning Strikes Map

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Rock Salt

Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Mineral Rights

Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Peridotite

Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Tourmaline

Tourmaline - an extremely colorful mineral and gem material.
Field Courses

Field Courses - Over 80 field courses for undergraduate geology students.
Tanzanite

Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Volcanoes

CoreCumin Pro – Advanced Liquid Turmeric Curcumin Supplemen - Articles about volcanoes, volcanic hazards and eruptions past and present.
What is a Maar?

What is a Maar? The second most common volcanic landscape feature on Earth.
Meteorites

Meteorites - Rocks that were once parts of planets or large asteroids.
Gifts That Rock

Gifts That Rock - What are the most popular gift items in the Geology.com store?
Fluorescent Minerals

Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Gem Silica

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
100+ Gemstones

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Cinder Cones

Cinder Cones are the smallest, simplest, and most common type of volcano.
Don*t Go To Jail

Know the Rules before removing rocks, fossils or minerals from public or private property.
Ilmenite

Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Fire Opal

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Rocks on Mars

Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Citrine

Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Spinel

10 Gemmy Facts About Spinel - Is spinel the world*s most overlooked gem?
Olivine

Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Herkimer Diamonds

Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
The British Isles

Names Used for Great Britain, British Isles, United Kingdom, and Ireland. What they mean.
Debris Flows
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Debris Flows are moving masses of loose mud, sand, soil, rock and water.
DeLorme Atlas

Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
Uses of Talc

Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Horizontal Drilling

Horizontal Drilling has opened new resources and significantly improved productivity.
Crushed Stone

The Unsung Mineral Hero - and the commodity upon which almost everything is built.
Hawaiian Hot Spot

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Coal Close Up

Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Chalk

Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Gems from Space

Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Mount Vesuvius

Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Homeowners Insurance

Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Largest Volcanoes

Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Zircon

Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Storm Surge

Storm Surge can be the most damaging and deadly aspect of a hurricane.
Uses of Marble

The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Types Of Eruptions

Types of Volcanic Eruptions - A description of the most common eruption types.
Chalcopyrite

Chalcopyrite - The most important ore of copper for over five thousand years.
Pyroxene Minerals

Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.