June 6th 1912
Novarupta - The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
US Diamond Mines
US Diamond Mines - Did you know that diamonds have been mined in the United States?
Mineraloids
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Fool*s Gold
Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Where Is Ukraine?
Ukraine is an independent state in eastern Europe that shares a border with Russia to its east.
Opals
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Fee Mining
Dig for Gems at dozens of sites across the United States. Keep what you find at most locations.
Corundum
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
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.
Soapstone
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Crystal Habit
Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Labradorite
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Peridotite
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Colored Diamonds
Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.
What Is The Moho?
What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Types of Maps
Types of Maps - Explore some of the most popular types of maps that have been made.
Obsidian
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Hematite
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Strawberry Quartz
Strawberry Quartz is a red to pink quartz with inclusions that look like strawberry seeds.
Minerals
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Great Lakes
Great Lakes : Map of the Great Lakes with surrounding states and provinces.
100+ Gemstones
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Birthstones
Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
ZOJIRUSHI Exterior From Japan for IH Rice Cooker NP-HLH18XA
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Lightning Strikes Map
Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Plate Tectonics
Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
Gem Silica
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Shale
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Lapis Lazuli
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Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Expansive Soil
Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Granite
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Geology Books
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UV Mineral Lamp
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Ethiopian Opal
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Hardness Picks
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Diamonds
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Rock Art
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What is a Geyser?
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Geology Tools
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Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Petrified Wood
Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Troglobites
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Curling Stones
Curling Stones are made from a special type of granite, found at just a few locations worldwide.
What is Geology?
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Andalusite
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Gemstones
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Tallest Tsunami
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Mineral Rights
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Morganite
Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Rhyolite
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Tallest Mountain
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What is a Maar?
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Quartzite
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Crater of Diamonds
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Teacher Resources
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Volcanic Explosivity
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Mineral Hardness
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Rare Earth Elements
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Grape Agate
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Darvaza Gas Crater
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Herkimer Diamonds
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Rhodochrosite
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Tanzanite
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Rocks on Mars
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Rock Tumblers
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Tourmaline
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Watch out for Ticks!
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Charoite
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Hand Lens
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Mineral Luster
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Citrine
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Chalcopyrite
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Turquoise
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Blue Flames
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Emerald
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Cinnabar
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Tallest Waterfall
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Waterproof Paper
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Fire Opal
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Don*t Go To Jail
Know the Rules before removing rocks, fossils or minerals from public or private property.
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Field Courses
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Underwater Volcano
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Debris Flows
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