Geology and Earth Science News and Information

Fluorescent Minerals and rocks glow with spectacular colors under ultraviolet light.

Rock Salt is a sedimentary rock composed of the mineral halite. It has many uses!

What is a Geyser? Photos and information about geysers in many parts of the world.

Ticks are a problem for geologists in some areas. Learn to recognize and avoid them.

Gem Silica is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.

Granite - The intrusive igneous rock that underlies continents and countertops.

Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.

Homeowners Insurance might not cover earthquake, hurricane and other geohazard damage.

Lapis Lazuli - a metamorphic rock and the most popular blue opaque gemstone in history.

Minerals - Descriptions, photos, articles, properties and uses for common minerals.

What is Geology? The study of Earth materials, structures, processes and life over time.

Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.

Diamonds - Learn about the properties of diamond, its many uses, and diamond discoveries.

Emerald is the most popular green gemstone in the United States and most of the world.

Grape Agate is a popular mineral specimen with the color and the shape of a bunch of grapes.

Coal Through a Microscope - Coal is more than a black rock. It is THE most interesting rock.

The Unsung Mineral Hero - and the commodity upon which almost everything is built.

Wall Maps - Wall maps of the world, continents, states and the USA.

Ant Hill Garnets - tiny gems that ants haul to the surface and discard on their anthill. Honest!

Free Google Earth software allows you to browse seamless world satellite images. Free.

What Is The Moho? The Mohorovicic Discontinuity is the mantle/crust boundary.

Gemstones - Colorful images and articles about diamonds and colored stones.

World*s Largest Diamonds Records for the largest rough, faceted and carbonado diamond.

The Rock Used to Make Beer - Geologists are beer experts and should know about this rock.

Cave of the Hands is a cave where ancient people painted hands about 9000 years ago.

Chalcopyrite - The most important ore of copper for over five thousand years.

Copper Kills COVID-19 and many other pathogens to limit the spread of disease.

Meteorites - Rocks that were once parts of planets or large asteroids.

Plate Tectonics - Articles and maps about plate tectonics and the interior of Earth.

Mount Etna - The most active volcano in Europe continues an eruption that started in 2001.

Geology Tools Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.

Rock & Mineral Kits The best way to learn about rocks and minerals is with specimens!

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.

Rocks - Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.

Rhyolite An extrusive igneous rock with a high silica content, produced from granitic magma.

Ilmenite - The primary ore of titanium and source of most titanium dioxide.

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure.

What Is Earth Science? The study of Earth and its neighbors in space. Learn more!

Crater of Diamonds - The only diamond mine in the world where you can be the miner.

Geodes look like ordinary rocks on the outside but can be spectacular inside!

Pictures of Opal - A collection of different types of opal from all around the world and Mars too!

Extraterrestrial Gems - A number of materials from space are used as attractive gems.

Fire Opal is a transparent to translucent opal with a yellow, orange or red background color.

Rare Earths - Special materials used in electronics, defense, medical & many other products.

Volcanoes - Articles about volcanoes, volcanic hazards and eruptions past and present.

Birthstones are gems assigned to the month of a person*s birth. They are popular gifts in the U.S.

The Next Hawaiian Island could be growing in the Pacific Ocean right now. Its name is Lo'ihi.

Labradorite is a feldspar mineral that sometimes exhibits an iridescent play-of-color.

Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.

Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.

Zircon is the primary ore of zirconium and a gemstone that is available in many colors.

Rocks on Mars Many of the rocks found on Mars are not very different from Earth rocks.

Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.

Portable UV Lamp - Short and long wave UV for fluorescent mineral viewing.

Shale - The rock that has quickly transformed the oil and gas industry.

Ruby and Sapphire are the 2nd and 3rd most popular colored stones in the United States.

Sliding Rocks Mystery - What causes these rocks to slide across a playa in Death Valley?

Bear Attacks - Knowing how to react to a bear encounter or attack could save your life.

Chalk is a variety of limestone formed from fine-grained marine sediment known as ooze.

Turquoise - A bluish-green gem material that has been used for over 6000 years.

The Uses of Marble are numerous and diverse. You will be surprised by how it is used.

Geology Books - A variety of books for reference, field trips, reading and more.

Largest Earthquake ever recorded - Magnitude 9.5. Chile, 1960.

Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.

Mars Meteorites Mars rovers have found dozens of meteorites traveling around the red planet.

Mount Vesuvius - geology, history, maps, facts and more about the Vesuvius eruptions.

Know the Rules before removing rocks, fossils or minerals from public or private property.

Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.

Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.

Horizontal Drilling has opened new resources and significantly improved productivity.

Debris Flows are moving masses of loose mud, sand, soil, rock and water.

Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.

Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for Gold.

The Acid Test - Geologists use dilute hydrochloric acid to identify carbonate minerals.

Diamond Misconception - Many people think that diamonds form from coal. Not True!

Pyroxene Minerals are a group of chain silicate minerals found in igneous and metamorphic rocks.

Peridotite is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.

Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.

What is the San Andreas Fault? Map, photos and description of the fault.

Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.

Tallest Tsunami - A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.

World Record Lightning - this lake has more lightning than any other place in the world.

Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.

Waterproof Paper - Don't take chances with your field notes and maps. Use waterproof paper.

Hematite - The most important ore of iron. A source of mineral pigment since prehistory.

Volcanic Explosivity - Rating volcanic eruptions based upon the volume of tephra ejected.

Mined in America - Small mines in the United States produce a diversity of beautiful gemstones.

Teacher Resources - K-12 resources for teaching about earth science.

Morganite is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.

Petrified Wood is a fossil that forms when silica replaces and infills the cavities of wood.

Tanzanite was unknown until a few decades ago but it has erupted into wide popularity.

Field Courses - Over 80 field courses for undergraduate geology students.

Charoite is a purple silicate mineral, found only in Russia, used as a gem material.

Ethiopian Opal - The new opal heavyweight that might give Australia a run.

Rock Art - People have been marking on rocks for thousands of years.

Sand is a diverse material. This gallery includes photos of sand from around the world.

US Diamond Mines - Did you know that diamonds have been mined in the United States?

The East Africa Rift System - The extensive fault system that is tearing Africa apart.

Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.

Largest Hurricanes Are they determined by wind speed, value of damage, most deaths?

Angel Falls in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.

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.

Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.

Diabase - the rock selected for Stonehenge and transported 240 miles in 2100 BC.

Coquina - A porous limestone composed almost entirely of fossil debris.

Range of Bear Species - Where you might encounter different types of bears.

Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.

Topo Maps - The DeLorme Atlas is an entire state of topo maps in one convenient book.

Solar System Volcanoes - Earth is not the only location of volcanic activity.

Soapstone is a metamorphic rock with properties that make it suitable for a variety of projects.

Gifts That Rock - What are the most popular gift items in the Geology.com store?

Types of Maps - Explore some of the most popular types of maps that have been made.

Hydraulic Fracturing increases well yield by fracturing the reservoir rock with fluid injection.

Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.

Expansive Soil causes more damage than floods, hurricanes & tornadoes combined.

Methane Hydrate deposits contain more fuel value than all other fossil fuels combined.

The Many Uses of Gold - Unique properties make gold one of the most useful metals.

Types of Volcanic Eruptions - A description of the most common eruption types.

Mineral Rights - Who owns the minerals under your land? Who wants to buy them?

Citrine is the transparent variety of quartz with a yellow to orange to reddish color.

Tourmaline - an extremely colorful mineral and gem material.

Colored Diamonds are diamonds with a noticeable body color. They can sell for over $1M/carat.

Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.

Utica Shale is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.

Lightning Strikes Map by NASA shows the worldwide distribution of lightning activity.

Storm Surge can be the most damaging and deadly aspect of a hurricane.

How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.

Names Used for Great Britain, British Isles, United Kingdom, and Ireland. What they mean.

What is a Maar? The second most common volcanic landscape feature on Earth.

How Are Hurricanes Named? There is a plan for naming tropical storms.

California Earthquake Maps - A collection of isoseismal maps for earthquakes in California.