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.
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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
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Shale
Shale - The rock that has quickly transformed the oil and gas industry.
Lapis Lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
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
Granite - The intrusive igneous rock that underlies continents and countertops.
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.
Ethiopian Opal
Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Hardness Picks
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Diamonds
Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
Rock Art
Rock Art - People have been marking on rocks for thousands of years.
What is a Geyser?
What is a Geyser? Photos and information about geysers in many parts of the world.
Geology Tools
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
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
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
Bear Attacks
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Curling Stones
Curling Stones are made from a special type of granite, found at just a few locations worldwide.
What is Geology?
What is Geology? The study of Earth materials, structures, processes and life over time.
Andalusite
Andalusite is a metamorphic mineral and a strongly pleochroic gem material.
Gemstones
Gemstones - Colorful images and articles about diamonds and colored stones.
Tallest Tsunami
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
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
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Quartzite
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.
Teacher Resources
Teacher Resources - K-12 resources for teaching about earth science.
Volcanic Explosivity
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Mineral Hardness
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Grape Agate
Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Darvaza Gas Crater
The Doorway to Hell is a flaming sinkhole seeping natural gas that has been burning for decades.
Herkimer Diamonds
Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Rhodochrosite
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Tanzanite
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Storm Surge
Storm Surge can be the most damaging and deadly aspect of a hurricane.
Rocks on Mars
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Rock Tumblers
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Rock Salt
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Tourmaline
Tourmaline - an extremely colorful mineral and gem material.
What is LNG?
What is LNG? Liquefied Natural Gas. The gas is condensed into a liquid for efficient transport.
Mount Vesuvius
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Map of the Oceans
Map of the Oceans - showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Charoite
Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Hand Lens
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Mineral Luster
What Is Luster? Luster is the light-reflecting characteristics of a mineral specimen.
Citrine
Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Chalcopyrite
Chalcopyrite - The most important ore of copper for over five thousand years.
Turquoise
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Blue Flames
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Emerald
Emerald is the most popular green gemstone in the United States and most of the world.
Cinnabar
Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Tallest Waterfall
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Waterproof Paper
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Don*t Go To Jail
Know the Rules before removing rocks, fossils or minerals from public or private property.
The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Chalk
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Utica Shale
Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Volcanoes
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Largest Volcanoes
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Olivine
Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Zircon
Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Mount Etna
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Field Courses
Field Courses - Over 80 field courses for undergraduate geology students.
Mars Meteorites
Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Ilmenite
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Underwater Volcano
Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
American Gemstones
Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Cinder Cones
Cinder Cones are the smallest, simplest, and most common type of volcano.
Copper
Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.
Debris Flows
Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Uses of Talc
Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Coquina
Coquina - A porous limestone composed almost entirely of fossil debris.
Helium
Helium is a byproduct of the natural gas industry. Its most important use is in MRI.
Largest Hurricanes
Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Spatter Cones
Spatter Cones are small, steep, volcanic cones built of welded basaltic lava.