Andalusite
Andalusite is a metamorphic mineral and a strongly pleochroic gem material.
Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
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.
Quartzite
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Rocks
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Helium
Helium is a byproduct of the natural gas industry. Its most important use is in MRI.
Pyroxene Minerals
Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.
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.
Hardness Picks
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Zircon
Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Crystal Habit
Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Sand
Sand is a diverse material. This gallery includes photos of sand from around the world.
Rock and Mineral Kits
Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Mineral Hardness
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Types of Maps
Types of Maps - Explore some of the most popular types of maps that have been made.
Largest Hurricanes
Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Map of the Oceans
Map of the Oceans - showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Coquina
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.
Mount Etna
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Volcanic Explosivity
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Blue Flames
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Tallest Tsunami
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Teacher Resources
Teacher Resources - K-12 resources for teaching about earth science.
Fool*s Gold
Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Rock Tumblers
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Geology Tools
Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
San Andreas Fault
What is the San Andreas Fault? Map, photos and description of the fault.
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Minerals
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Obsidian
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Cinnabar
Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Opals
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Mars Meteorites
Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Utica Shale
Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Morganite
Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Mineraloids
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
American Gemstones
Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Soapstone
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Corundum
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Rhodochrosite
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
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.
Labradorite
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Underwater Volcano
Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Gemstones
Gemstones - Colorful images and articles about diamonds and colored stones.
Charoite
Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Granite
Granite - The intrusive igneous rock that underlies continents and countertops.
June 6th 1912
Novarupta - The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
What is Geology?
What is Geology? The study of Earth materials, structures, processes and life over time.
What Is The Moho?
What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Ethiopian Opal
Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Birthstones
Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
Shale
Shale - The rock that has quickly transformed the oil and gas industry.
Azurite
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
Diamonds
Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
100+ Gemstones
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
DeLorme Atlas
Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
Gem Silica
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Hand Lens
Star HighsHand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Methane Hydrate
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Geodes
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Mineral Rights
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Waterproof Paper
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Grape Agate
Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Turquoise
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Herkimer Diamonds
Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Hematite
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Meteorites
Meteorites - Rocks that were once parts of planets or large asteroids.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
Rock Salt
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Expansive Soil
Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Lapis Lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Chalcopyrite
Chalcopyrite - The most important ore of copper for over five thousand years.
Rhyolite
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Lightning Strikes Map
Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Volcanoes
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Geology Books
Geology Books - A variety of books for reference, field trips, reading and more.
Plate Tectonics
Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
UV Mineral Lamp
Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Emerald
Emerald is the most popular green gemstone in the United States and most of the world.
Tallest Mountain
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Rock Art
Rock Art - People have been marking on rocks for thousands of years.
Tanzanite
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Rocks on Mars
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Ant Hill Garnets
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Field Courses
Field Courses - Over 80 field courses for undergraduate geology students.
Debris Flows
Debris Flows are moving masses of loose mud, sand, soil, rock and water.
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Tallest Waterfall
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Tourmaline
Tourmaline - an extremely colorful mineral and gem material.
Homeowners Insurance
Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Chalk
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Petrified Wood
Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
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.
Storm Surge
Storm Surge can be the most damaging and deadly aspect of a hurricane.
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.
Mount Vesuvius
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Ilmenite
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
What is a Geyser?
What is a Geyser? Photos and information about geysers in many parts of the world.
Horizontal Drilling
Horizontal Drilling has opened new resources and significantly improved productivity.
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.