Fluorescent Minerals glow with spectacular colors under ultraviolet light.
Dowsing is a method used to find underground water that is rejected by most geologists.
Exploring a Hydrocarbon Sea on Titan with a submarine is a potential NASA mission.
Chatoyant Gems look like the eye of a cat. A line of light moves across the surface of the stone.
Geology.com News is updated several times each week. Read it here or receive email updates.
Minerals - Descriptions, photos, articles, properties and uses for common minerals.
Plate Tectonics - Articles, maps, information about plate tectonics and the interior of Earth.
Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
|Huge Diamond Deposit
The Largest Diamond Deposit in the world could be under Popigai Crater in Russia.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Pictures of Opal - A collection of different types of opal from all around the world and Mars too!
Diamonds - Learn about the properties of diamond, its many uses and diamond discoveries.
Hematite - The most important ore of iron. A source of mineral pigment since prehistory.
Gemstones - Colorful images and articles about diamonds and colored stones.
||The Brewery Rock ?
The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.
How Do Snowflakes Form? They start as tiny crystals and change as they fall to Earth.
Homeowners Insurance usually does not cover the most common geologic hazards.
||Find Minerals & Gems
Find Minerals and Gems - Dozens of sites where you can dig and keep what you find.
Obsidian - the volcanic rock that cools so quickly that it becomes a natural glass.
Rock Glaciers - Masses of rock, ice, snow, mud and water that slowly flow down slope.
Geologist Tools - Visit our store for a large selection of field and laboratory tools.
||Oil and Gas
Oil and Gas - Articles about oil and natural gas in the US and around the world.
Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?
Granite - The intrusive igneous rock that underlies continents and countertops.
Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.
||Land Below Sea Level
Land Below Sea Level - Did you know that dozens of land locations are below sea level?
||Asteroid Impact Map
Asteroid Impact Map - Explore fifty of the most obvious asteroid impact craters on Earth.
||Hawaiian Hot Spot
How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Shale - The rock that has quickly transformed the oil and gas industry.
Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.
Emerald is the most popular green gemstone in the United States and most of the world.
Ammolite is a fossil and a gemstone. It is shell material from fossil ammonites.
100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.
||Sea Level Rise Map
Sea Level Rise Map - A Google map that shows where flooding will occur as sea level rises.
Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.
Basalt - Most of the ocean basin and part of the continents are underlain by basalt.
Salt Domes - Columns of salt that move upwards because of their low specific gravity.
Turquoise - A bluish-green gem material that has been used for over 6000 years.
Fossils - Learn about fossils and discoveries around the world.
||Gems from Space
Extraterrestrial Gems - A number of materials from space are used as attractive gems.
Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-colors
||Volcanoes in Space
Extraterrestrial Volcanoes - Earth is not the only solar system body with volcanoes.
||Crater of Diamonds
Crater of Diamonds - The only diamond mine in the world where you can be the miner.
||Google Earth - Free
Free Google Earth software allows you to browse seamless world satellite images. Free.
|What Is Earth Science?
What Is Earth Science? The study of Earth and its neighbors in space. Learn more!
Rock Art - People have been marking on rocks for thousands of years.
Diamond Misconception - Lots of people think that diamonds form from coal. Not True!
||US Diamond Mines
US Diamond Mines - Did you know that diamonds have been found in the United States?
|What is Geology?
What is Geology? - The study of Earth materials, structures, processes and life over time.
||Ruby and Sapphire
Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.
Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.
Astronomy - Fantastic images and articles about solar system and deep-space astronomy.
|Geologic Time Scale
Divisions of Geologic Time - USGS time scale with unit names and age estimates.
Teacher Resources - K-12 resources for teaching about earth science.
Meteorites - Rocks that were once parts of planets or large asteroids.
||Cave of the Hands
Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.
|San Andreas Fault
The San Andreas Fault - A feature that separates the Pacific and North American Plates.
||Uses of Gold
The Many Uses of Gold - Unique properties make gold one of the most useful metals.
||What Is The Moho?
What Is The Moho? Learn about the Mohorovicic Discontinuity - the mantle/crust boundary.
Petrified Wood is a fossil that forms when dissolved material preciptates and replaces wood.
|Rare Earth Elements
Rare Earths - Special materials used in electronics, defense, medical & many other products.
Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Sand is a diverse material. This gallery includes photos of sand from around the world.
Organic Gems are gems formed from or by plants or animals. They might also be fossils.
|USA Landslide Map
Landslide Incidence Map - A USGS map showing landslide incidence in the United States.
Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.
Ametrine is a bicolor quartz (amethyst + citrine) and a gemstone of growing popularity.
||Great Rift Valley
The East Africa Rift System - The extensive fault system that is tearing Africa apart.
|Facts About Copper
Facts About Copper - Information about copper uses, production, resources and more.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Troglobites are creatures that have adapted to a permanent life in the darkness of a cave.
Horizontal Drilling has opened new resources and significantly improved productivity.
Pavlof Volcano is one of the most active volcanoes in North America and a threat to air traffic.
||The Acid Test
The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.
Iolite is the gem variety of the mineral cordierite. An alternative to sapphire and tanzanite.
Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.
|Rocks on Mars
Rocks on Mars - Many of the rocks found on Mars are not very different from Earth rocks.
Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.
Frac Sand - The amount of frac sand produced in the USA is up by over 300% since 2009.
||Types Of Eruptions
Types of Volcanic Eruptions - A description of the most common eruption types.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Metals are important mineral products used in manufacturing and construction projects.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
||Watch out for Ticks!
Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.
Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.
Largest Desert - The Sahara is huge but two polar deserts are larger.
Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.
The Host Rock of Diamonds - Diamonds are found in Kimberlite, a variety of peridotite.
Most Powerful Eruption of the 20th Century - One hour later, the blast was heard in Juneau.
||Uses of Marble
The Uses of Marble are numerous and diverse. You will be surprised by how it is used.
|Lunar Rift System
Lunar Rift System? Gravity maps revise the geologic history of the near side of the moon.
Hydraulic Fracturing - Increases well yield by fracturing the reservoir rock with fluid injection.
Sunstone is a gem feldspar with aventurescence caused by light reflecting from platy inclusions.
||What is a Geyser?
Photos of Geysers from around the world with information about height, eruption interval, more.
Salt Glaciers are masses of salt that flow downslope under their own weight.
||Coal Close Up
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.
||What is LNG?
What is LNG? The use of LNG as an energy source is growing rapidly. Learn more about LNG.
Pumice is a rock formed during explosive volcanic eruptions. It has a wide variety of uses.
||What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Oil Sands contain oil in the form of bitumen. A major oil resource that can be difficult to produce.
||Eagle Ford Shale
Eagle Ford Shale - One of the most prolific producers of oil and gas in the United States.