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Herkimer Diamonds
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Gem Silica
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Chalk
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Olivine
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Underwater Volcano
Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Minerals
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Uses of Talc
Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Rocks
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
100+ Gemstones
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Darvaza Gas Crater
The Doorway to Hell is a flaming sinkhole seeping natural gas that has been burning for decades.
Homeowners Insurance
Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Plate Tectonics
Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
Wall Maps
Wall Maps - Wall maps of the world, continents, states and the USA.
Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Lapis Lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Rock Salt
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Obsidian
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Don*t Go To Jail
Know the Rules before removing rocks, fossils or minerals from public or private property.
Grape Agate
Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Granite
Granite - The intrusive igneous rock that underlies continents and countertops.
Birthstones
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Emerald
Emerald is the most popular green gemstone in the United States and most of the world.
Diamonds
Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
Rhyolite
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Types of Maps
Types of Maps - Explore some of the most popular types of maps that have been made.
Gemstones
Gemstones - Colorful images and articles about diamonds and colored stones.
Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Chalcopyrite
Chalcopyrite - The most important ore of copper for over five thousand years.
Rock and Mineral Kits
Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Rocks on Mars
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Meteorites
Meteorites - Rocks that were once parts of planets or large asteroids.
Waterproof Paper
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Hardness Picks
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Quartzite
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Hand Lens
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Ilmenite
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Opals
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Geology Books
Geology Books - A variety of books for reference, field trips, reading and more.
UV Mineral Lamp
Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Volcanoes
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Labradorite
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Bear Attacks
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Debris Flows
Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Fool*s Gold
Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Copper
Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.
Spatter Cones
Spatter Cones are small, steep, volcanic cones built of welded basaltic lava.
Rhodochrosite
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Field Courses
Field Courses - Over 80 field courses for undergraduate geology students.
Andalusite
Andalusite is a metamorphic mineral and a strongly pleochroic gem material.
Tallest Tsunami
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
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Rock Art
Rock Art - People have been marking on rocks for thousands of years.
Turquoise
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Geology Tools
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Rock Tumblers
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Sand
Sand is a diverse material. This gallery includes photos of sand from around the world.
Mineral Rights
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
What Is The Moho?
What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Ant Hill Garnets
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Mineral Luster
What Is Luster? Luster is the light-reflecting characteristics of a mineral specimen.
Expansive Soil
Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Teacher Resources
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Morganite
Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
DeLorme Atlas
Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
The Acid Test
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Citrine
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Cinnabar
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Corundum
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June 6th 1912
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Ethiopian Opal
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Helium
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Mineral Hardness
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Map of the Oceans
Map of the Oceans - showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Mars Meteorites
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Zircon
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Tallest Mountain
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What is Geology?
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Mineraloids
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Crystal Habit
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Volcanic Explosivity
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Largest Hurricanes
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Petrified Wood
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US Diamond Mines
US Diamond Mines - Did you know that diamonds have been mined in the United States?
Hematite
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Lightning Strikes Map
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Colored Diamonds
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What is a Maar?
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Coquina
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Peridotite
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Pyroxene Minerals
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Tallest Waterfall
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Tourmaline
Tourmaline - an extremely colorful mineral and gem material.
Charoite
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Phytoplankton Blooms
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What is a Geyser?
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Soapstone
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Mount Etna
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Cinder Cones
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Utica Shale
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Storm Surge
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Mount Vesuvius
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Azurite
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