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General Geology
Geologic Hazards
Oil and Gas
Plate Tectonics
Satellite Images
Teacher Resources
U.S. Maps
World Maps
World Records


Chalcopyrite - The most important ore of copper for over five thousand years.
Gifts That Rock

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

Meteorites - Rocks that were once parts of planets or large asteroids.
Google Earth - Free

Free Google Earth software allows you to browse seamless world satellite images. Free.
Types Of Eruptions

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

Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.

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

Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
The Brewery Rock ?

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

Spatter Cones are small, steep, volcanic cones built of welded basaltic lava.

Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.

Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Debris Flows

Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Uses of Marble

The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Fire Opal

BAISITEJIA Kitchen Non-Slip Door Floor Mat Room Pad Cushion Carp is a transparent to translucent opal with a yellow, orange or red background color.

Andalusite is a metamorphic mineral and a strongly pleochroic gem material.

Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Rare Earth Elements

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

Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Crater of Diamonds

Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Gems from Space

Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Rock and Mineral Kits

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

Where Are the Canary Islands? Off the northwest coast of Africa, 60 miles west of Morocco.
Bear Attacks

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

Helium is a byproduct of the natural gas industry. Its most important use is in MRI.
Hardness Picks

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

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

Types of Maps - Explore some of the most popular types of maps that have been made.
Mineral Luster

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

Phytoplankton Blooms are caused by an explosive growth rate of plankton in surface waters.
Crystal Habit

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

Sand is a diverse material. This gallery includes photos of sand from around the world.

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

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

Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Largest Hurricanes

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
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Map of the Oceans

Map of the Oceans - showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.

Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Fool*s Gold

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

Coquina - A porous limestone composed almost entirely of fossil debris.
Ruby and Sapphire

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

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Volcanic Explosivity
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Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Tallest Tsunami

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

The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
San Andreas Fault

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

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

Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Mount Etna

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

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

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

Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
Teacher Resources

Teacher Resources - K-12 resources for teaching about earth science.
Wall Maps
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Wall Maps - Wall maps of the world, continents, states and the USA.

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

Granite - The intrusive igneous rock that underlies continents and countertops.
E.T. Volcanoes

Solar System Volcanoes - Earth is not the only location of volcanic activity.
Utica Shale
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Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.

Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.

Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Mars Meteorites

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

Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Watch out for Ticks!

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
US Diamond Mines

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

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

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

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

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

Emerald is the most popular green gemstone in the United States and most of the world.
Fluorescent Minerals

Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
What is Geology?

What is Geology? The study of Earth materials, structures, processes and life over time.
Gold Pans

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

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

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

Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Underwater Volcano

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

The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Sliding Rocks

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

Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Hurricane Names

How Are Hurricanes Named? There is a plan for naming tropical storms.
Bear Map

Range of Bear Species - Where you might encounter different types of bears.
Uses of Gold

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

Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Geology Books

Geology Books - A variety of books for reference, field trips, reading and more.
Largest Diamonds

World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.
Gem Silica
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Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Rock Art
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Rock Art - People have been marking on rocks for thousands of years.
Hand Lens

Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Ethiopian Opal

Ethiopian Opal - The new opal heavyweight that might give Australia a run.
American Gemstones

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
What Is Earth Science?

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!

Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Grape Agate

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

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

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

Tourmaline - an extremely colorful mineral and gem material.
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Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Ant Hill Garnets

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

California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.
Herkimer Diamonds

Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Waterproof Paper

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

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

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

The Unsung Mineral Hero - and the commodity upon which almost everything is built.
June 6th 1912

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

Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
100+ Gemstones

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Lightning Strikes Map

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Hawaiian Hot Spot

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Field Courses

Field Courses - Over 80 field courses for undergraduate geology students.
Cave of the Hands

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

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

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

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

Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Tallest Mountain

Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.

Shale - The rock that has quickly transformed the oil and gas industry.
UV Mineral Lamp

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

Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Coal Close Up

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

Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
What is a Maar?

What is a Maar? The second most common volcanic landscape feature on Earth.
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Turquoise - A bluish-green gem material that has been used for over 6000 years.
Homeowners Insurance

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

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

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

Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Don*t Go To Jail

Know the Rules before removing rocks, fossils or minerals from public or private property.
Uses of Talc

Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
The British Isles

Names Used for Great Britain, British Isles, United Kingdom, and Ireland. What they mean.
Storm Surge

Storm Surge can be the most damaging and deadly aspect of a hurricane.
What is a Geyser?

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

Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Petrified Wood

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

Cinder Cones are the smallest, simplest, and most common type of volcano.