Gifts That Rock - What are the most popular gift items in the Geology.com store?
Chalcopyrite - The most important ore of copper for over five thousand years.
Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.
Free Google Earth software allows you to browse seamless world satellite images. Free.
Meteorites - Rocks that were once parts of planets or large asteroids.
Types of Volcanic Eruptions - A description of the most common eruption types.
Gemstones - Colorful images and articles about diamonds and colored stones.
Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
Spatter Cones are small, steep, volcanic cones built of welded basaltic lava.
Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Debris Flows are moving masses of loose mud, sand, soil, rock and water.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
Andalusite is a metamorphic mineral and a strongly pleochroic gem material.
Knights Templar Helmet Cross and Sword Medieval Crusader Sweatsh - Special materials used in electronics, defense, medical & many other products.
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Where Are the Canary Islands? Off the northwest coast of Africa, 60 miles west of Morocco.
Helium is a byproduct of the natural gas industry. Its most important use is in MRI.
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Types of Maps - Explore some of the most popular types of maps that have been made.
What Is Luster? Luster is the light-reflecting characteristics of a mineral specimen.
Phytoplankton Blooms are caused by an explosive growth rate of plankton in surface waters.
Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Sand is a diverse material. This gallery includes photos of sand from around the world.
Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Map of the Oceans - showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?
Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Coquina - A porous limestone composed almost entirely of fossil debris.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
What is the San Andreas Fault? Map, photos and description of the fault.
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
World Record Lightning - this lake has more lightning than any other place in the world.
Wall Maps - Wall maps of the world, continents, states and the USA.
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Gabriel G52194 Ultra Strut, 1 Pack - K-12 resources for teaching about earth science.
Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Granite - The intrusive igneous rock that underlies continents and countertops.
Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
Solar System Volcanoes - Earth is not the only location of volcanic activity.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
We Can All Agree Stay Home Carole Killed Her Husband - Engraved is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
Mars Meteorites Mars rovers have found dozens of meteorites while exploring the red planet.
Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Emerald is the most popular green gemstone in the United States and most of the world.
Hawaii*s Next Island could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.
US Diamond Mines - Did you know that diamonds have been mined in the United States?
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.
Field Courses - Over 80 field courses for undergraduate geology students.
10 Gemmy Facts About Spinel - Is spinel the world*s most overlooked gem?
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
What is Geology? The study of Earth materials, structures, processes and life over time.
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for Gold.
Ethiopian Opal - The new opal heavyweight that might give Australia a run.
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
Shale - The rock that has quickly transformed the oil and gas industry.
Diamond Misconception - Many people think that diamonds form from coal. Not True!
The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.
Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
How Are Hurricanes Named? There is a plan for naming tropical storms.
World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.
Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.
Rock Art - People have been marking on rocks for thousands of years.
Geology Books - A variety of books for reference, field trips, reading and more.
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
Tourmaline - an extremely colorful mineral and gem material.
Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.
Range of Bear Species - Where you might encounter different types of bears.
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.
Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!
The Science of Fireworks Learn how the colors and shapes are created.
Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.
Citrine is the transparent variety of quartz with a yellow to orange to reddish color.
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Deepest Point in the Ocean The deepest point in the ocean is in the Mariana Trench.
Novarupta - The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.
Geodes look like ordinary rocks on the outside but can be spectacular inside!
Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
The Unsung Mineral Hero - and the commodity upon which almost everything is built.
Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!
Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.
Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
Turquoise - A bluish-green gem material that has been used for over 6000 years.
How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
What is a Geyser? Photos and information about geysers in many parts of the world.
Know the Rules before removing rocks, fossils or minerals from public or private property.
Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.
Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
100 Days Smarter Popping through 100 Days of School T-Shirt British Isles, United Kingdom, and Ireland. What they mean.
What is a Maar? The second most common volcanic landscape feature on Earth.
Storm Surge can be the most damaging and deadly aspect of a hurricane.
Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Cinder Cones are the smallest, simplest, and most common type of volcano.
Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.