Quartzite
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
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.
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.
Rocks
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
Mineral Hardness
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
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
Wind - 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.
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.
Tallest Tsunami
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.
Mars Meteorites
Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Geology Tools
Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Cinnabar
Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Utica Shale
Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
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.
US Diamond Mines
US Diamond Mines - Did you know that diamonds have been mined in the United States?
Minerals
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
American Gemstones
Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Mineraloids
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Soapstone
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Underwater Volcano
Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Charoite
Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
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Rhodochrosite
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
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.
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.
Birthstones
Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
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.
What is Geology?
What is Geology? The study of Earth materials, structures, processes and life over time.
Granite
Granite - The intrusive igneous rock that underlies continents and countertops.
Azurite
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
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.
Emerald
Emerald is the most popular green gemstone in the United States and most of the world.
Grape Agate
Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
What Is The Moho?
What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
DeLorme Atlas
Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
Petrified Wood
Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.
Gem Silica
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Rhyolite
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Expansive Soil
Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Plate Tectonics
Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
Lapis Lazuli
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
UV Mineral Lamp
Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Tallest Mountain
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Ant Hill Garnets
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Fire Opal
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Meteorites
Meteorites - Rocks that were once parts of planets or large asteroids.
Rock Art
Rock Art - People have been marking on rocks for thousands of years.
Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Debris Flows
Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Ilmenite
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Waterproof Paper
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Citrine
Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Field Courses
Field Courses - Over 80 field courses for undergraduate geology students.
Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Herkimer Diamonds
Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Turquoise
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
Fluorescent Minerals
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Rocks on Mars
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Volcanoes
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
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.
100+ Gemstones
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Don*t Go To Jail
Know the Rules before removing rocks, fossils or minerals from public or private property.
Chalcopyrite
Chalcopyrite - The most important ore of copper for over five thousand years.
What is a Geyser?
What is a Geyser? Photos and information about geysers in many parts of the world.
Olivine
Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Tanzanite
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Chalk
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Rock Salt
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
Lightning Strikes Map
Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Tourmaline
Tourmaline - an extremely colorful mineral and gem material.
Cinder Cones
Cinder Cones are the smallest, simplest, and most common type of volcano.
Mineral Rights
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Uses of Talc
Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Horizontal Drilling
Horizontal Drilling has opened new resources and significantly improved productivity.
Largest Volcanoes
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Tallest Waterfall
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
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.