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Categories
Diamonds
Earthquakes
Fossils
Gemstones
Steel Hot Dog Marshmallow Barbecue Skewers, Novelty Humanoid For
Geologic Hazards
Gold
Landslides
Metals
Meteorites
Minerals
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Plate Tectonics
Rocks
Satellite Images
Teacher Resources
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Volcanoes
World Maps
World Records

Canary Islands

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

Phytoplankton Blooms are caused by an explosive growth rate of plankton in surface waters.
Bear Attacks

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

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

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

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

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

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

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

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

Coquina - A porous limestone composed almost entirely of fossil debris.
Largest Hurricanes

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Mount Etna

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

Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
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.
Blue Flames

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Record Lightning

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

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Types of Maps

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

Teacher Resources - K-12 resources for teaching about earth science.
Largest Earthquake

Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
Tallest Tsunami
LSpace Black Seaside Romper, US Large
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Rock Tumblers

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

Solar System Volcanoes - Earth is not the only location of volcanic activity.
Mars Meteorites

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

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

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

Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Geology Tools

Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Fool*s Gold

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

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

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

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

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

Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Watch out for Ticks!

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

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

Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Google Earth - Free

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

Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Copper vs COVID-19

Copper Kills COVID-19 and many other pathogens to limit the spread of disease.
Underwater Volcano

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

The Science of Fireworks Learn how the colors and shapes are created.
Charoite

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

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

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

Range of Bear Species - Where you might encounter different types of bears.
Greatest Ocean Depth

Deepest Point in the Ocean The deepest point in the ocean is in the Mariana Trench.
Labradorite

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

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

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

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

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

Wall Maps - Wall maps of the world, continents, states and the USA.
June 6th 1912

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

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

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

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

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

Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
Granite

Granite - The intrusive igneous rock that underlies continents and countertops.
Geodes

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

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

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

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

Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
What Is The Moho?

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

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

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

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

Emerald is the most popular green gemstone in the United States and most of the world.
What Is Earth Science?
Bicycle Accessories, Mountain Bike Rotors G3 Bicycle Brake Disc
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
DeLorme Atlas

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

Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Petrified Wood

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

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

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

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

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

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

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

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

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

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

Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Hand Lens

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

Meteorites - Rocks that were once parts of planets or large asteroids.
Types Of Eruptions

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

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Gem Silica

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Rock Art

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

Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Largest Diamonds

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

Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Waterproof Paper

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

Field Courses - Over 80 field courses for undergraduate geology students.
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Cave of the Hands
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Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Rare Earth Elements

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

Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Crater of Diamonds

Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Citrine
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Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Storm Surge

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

Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
What is a Maar?

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

Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Herkimer Diamonds
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Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Fluorescent Minerals

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

Turquoise - A bluish-green gem material that has been used for over 6000 years.
Rock Salt

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

10 Gemmy Facts About Spinel - Is spinel the world*s most overlooked gem?
Don*t Go To Jail

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

Tourmaline - an extremely colorful mineral and gem material.
What is a Geyser?

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

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

Chalcopyrite - The most important ore of copper for over five thousand years.
Hawaiian Hot Spot

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
100+ Gemstones

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

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

Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Lightning Strikes Map

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Cinder Cones

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

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

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

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

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

Horizontal Drilling has opened new resources and significantly improved productivity.
Uses of Talc

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

Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Gifts That Rock
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Gifts That Rock - What are the most popular gift items in the Geology.com store?
Mineral Rights

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

The Unsung Mineral Hero - and the commodity upon which almost everything is built.
Tallest Waterfall

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Uses of Marble

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

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

Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Pyroxene Minerals

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