Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
||San Andreas Fault
The San Andreas Fault - A feature that separates the Pacific and North American Plates.
||Asteroid Impact Map
Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
||Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
||Geology of Gems
Geology of Gems - The first comprehensive book on the geology of gem deposits.
|What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Turquoise - A bluish-green gem material that has been used for over 6000 years.
||Facts About Copper
Facts About Copper - Information about copper uses, production, resources and more.
Geology Tools - Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
||Sea Level Rise Maps
Sea Level Rise Maps - See what will be flooded as sea level rises.
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Abandoned Mine accidents take 20 to 30 lives per year. Many can be prevented with education.
||Lightning Strikes Map
Lightning Strikes Map - A NASA map showing the worldwide distribution of lightning activity.
Wall Maps - Wall maps of the world, continents, states and the USA.
California Earthquake Maps A collection of isoseismal maps for earthquakes in California.
||Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
Emerald is the most popular green gemstone in the United States and most of the world.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Homeowners Insurance usually does not cover the most common geologic hazards.
||UV Mineral Lamp
Portable UV Lamp - short / long wave for fluorescent minerals. Safety glasses included.
Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
|Great Rift Valley
The East Africa Rift System - The extensive fault system that is tearing Africa apart.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Diamond Misconception - Lots of people think that diamonds form from coal. Not True!
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Chalcopyrite - The most important ore of copper for over five thousand years.
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
||Uses of Gold
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
Gfeller Leather field cases, hammer holsters, lanyards, field belts, acid bottle cases, more.
Pavlof Volcano is one of the most active volcanoes in North America and a threat to air traffic.
Dowsing is a method used to find underground water that is rejected by most geologists.
Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions.
Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.
||The Brewery Rock ?
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
||Arctic Seafloor Map
Arctic Ocean Seafloor Map The ridges, basins, shelves and rifts defining the Arctic seafloor.
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
||USA Landslide Map
Landslide Incidence Map - A USGS map showing landslide incidence in the United States.
||Gems from Space
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Gold Pans and Panning Kits - classifiers, snuffer bottles. Pans sized for kids to Goliath.
||Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Sand is a diverse material. This gallery includes photos of sand from around the world.
Range of Bear Species - Where you might encounter different types of bears.
Meteorite Identification Step one in identifying a possible meteorite is the magnet test.
Rock Kits for classroom and personal study. A great way to learn about rocks.
Rock Bags - Durable field bags with pockets for carrying maps, books, specimens and tools.
Gemstones - Colorful images and articles about diamonds and colored stones.
Shale - The rock that has quickly transformed the oil and gas industry.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
||Rocks on Mars
Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks.
Teacher Resources - K-12 resources for teaching about earth science.
Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood.
||The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Granite - The intrusive igneous rock that underlies continents and countertops.
||What Is The Moho?
What Is The Moho? Learn about the Mohorovicic Discontinuity - the mantle/crust boundary.
Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
||Huge Diamond Deposit
The Largest Diamond Deposit in the world could be under Popigai Crater in Russia.
|US Diamond Mines
US Diamond Mines - Did you know that diamonds have been mined in the United States?
Rock Glaciers - Masses of rock, ice, snow, mud and water that slowly flow down slope.
Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.
Meteorites - Rocks that were once parts of planets or large asteroids.
Red Beryl is one of the rarest gems. Small amounts are mined at one locality in Utah.
Expansive Soil Causes more damage than floods, hurricanes & tornadoes combined.
|What is Geology?
What is Geology? - The study of Earth materials, structures, processes and life over time.
||Types Of Eruptions
Types of Volcanic Eruptions - A description of the most common eruption types.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
Chatoyant Gems look like the eye of a cat. A line of light moves across the surface of the stone.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Field Camps - Over 80 field courses for undergraduate geology students.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
||Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
The Richest Meteorite Field - More meteorites found here than anywhere else on Earth.
Rhodonite - a manganese silicate used as a minor ore of manganese and as a gemstone.
||Coal Close Up
Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.
Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009.
||What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Olivine Rain? Spitzer Telescope discovered a rain of olivine crystals on protostar HOPS-68.
Rock Art - People have been marking on rocks for thousands of years.
||What are Glaciers?
What are Glaciers? Learn how glaciers form, flow, advance, retreat, and change over time.
Mineral Rights Who owns the minerals under your land? Who wants to buy them?
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Hardness Picks - Mohs hardness testing with precise and easy-to-use hardness picks.
||Oil Fields from Space
Oil Fields from Space - Night views of Earth show the distribution of oil field activity.
Horizontal Drilling has opened new resources and significantly improved productivity.
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
Canadian Diamond Mines produce some of the largest and highest quality gems!
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
|What is a Geyser?
Photos of Geysers from around the world with information about height, eruption interval, more.
Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Crushed Stone - About four tons per person is used each year in the United States.
|What is LNG?
What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG.
Triboluminescence is a flash produced when a mineral is rubbed, scratched or broken.
Salt Domes - Salt structures that are often associated with oil and natural gas.
Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
|Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
||Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
|Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
||Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries.
Fossils - Learn about fossils and discoveries around the world.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
|San Andreas Fault Map
Google Map of the San Andreas Fault Zoom in to see the fault trace on satellite images.
||Fee Mining Sites
Fee Mining sites are mines that you can enter, pay a fee, and keep anything that you find.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
|Oil and Gas
Oil and Gas - Articles about oil and natural gas in the US and around the world.
Wrong Volcano! The most powerful eruption of the 20th century was misidentified?
Azurite Granite ? A white granite with blue orbs of azurite. A new material from Pakistan.
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Beryl - the gem mineral of emerald, aquamarine, red beryl, morganite and heliodor.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.