Uses of MarbleThe Uses of Marble
are numerous and diverse. You will be surprised by how it is used.
- Articles about volcanoes, volcanic hazards and eruptions past and present.
Debris FlowsDebris Flows
are moving masses of loose mud, sand, soil, rock and water.
is a metamorphic mineral and a strongly pleochroic gem material.
Rare Earth ElementsRare Earths
- Special materials used in electronics, defense, medical & many other products.
Fire OpalFire Opal
is a transparent to translucent opal with a yellow, orange or red background color.
is metamorphic rock formed when sandstone is subjected to heat and pressure.
Crater of DiamondsCrater of Diamonds
- The only diamond mine in the world where you can be the miner.
- Galleries of igneous, sedimentary and metamorphic rock photos with descriptions.
is a byproduct of the natural gas industry. Its most important use is in MRI.
Pyroxene MineralsPyroxene Minerals
are a group of chain silicate minerals found in igneous and metamorphic rocks.
Bear AttacksBear Attacks
- Knowing how to react to a bear encounter or attack could save your life.
Phytoplankton BloomsPhytoplankton Blooms
are caused by an explosive growth rate of plankton in surface waters.
Mineral LusterWhat Is Luster?
Luster is the light-reflecting characteristics of a mineral specimen.
Hardness PicksHardness Picks
- Test for hardness with precise and easy-to-use hardness picks.
is the primary ore of zirconium and a gemstone that is available in many colors.
is a diverse material. This gallery includes photos of sand from around the world.
Rock and Mineral KitsRock & Mineral Kits
The best way to learn about rocks and minerals is with specimens!
Crystal HabitCrystal Habit
is the external shape displayed by a crystal or an aggregate of crystals.
Mineral HardnessMohs Hardness Scale
is a set of reference minerals used for classroom hardness testing.
Types of MapsTypes of Maps
- Explore some of the most popular types of maps that have been made.
Largest HurricanesLargest Hurricanes
Are they determined by wind speed, value of damage, most deaths?
Map of the OceansMap of the Oceans
- showing the Atlantic, Pacific, Indian, Arctic, and Southern Oceans.
Ruby and SapphireRuby and Sapphire
are the 2nd and 3rd most popular colored stones in the United States.
- A porous limestone composed almost entirely of fossil debris.
Mount EtnaMount Etna
- The most active volcano in Europe continues an eruption that started in 2001.
Geology ToolsGeology Tools
Rock hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Volcanic ExplosivityVolcanic Explosivity
- Rating volcanic eruptions based upon the volume of tephra ejected.
The Acid TestThe Acid Test
- Geologists use dilute hydrochloric acid to identify carbonate minerals.
Tallest TsunamiTallest Tsunami
- A wave with a run-up height of 1720 feet occurred in Lituya Bay, Alaska.
Teacher ResourcesTeacher Resources
- K-12 resources for teaching about earth science.
- Descriptions, photos, articles, properties and uses for common minerals.
Fool*s GoldFool*s Gold
is a name used for pyrite when its brassy color fools people looking for gold.
Rock TumblersRock Tumblers
- All about rock tumblers and rock tumbling. Read before you buy a tumbler.
- the volcanic rock that cools so quickly that it becomes a natural glass.
- the only important ore of mercury. Used in pigments until its toxicity was realized.
OpalsPictures of Opal
- A collection of different types of opal from all around the world and Mars too!
Google Earth - FreeFree Google Earth
software allows you to browse seamless world satellite images. Free.
Mars MeteoritesMars Meteorites
Mars rovers have found dozens of meteorites while exploring the red planet.
is an orange to pink gemstone, a variety of beryl, that is growing rapidly in popularity.
Utica ShaleUtica Shale
is a major source of oil, natural gas and natural gas liquids in PA, OH and WV.
US Diamond MinesUS Diamond Mines
- Did you know that diamonds have been mined in the United States?
Wall MapsWall Maps
- Wall maps of the world, continents, states and the USA.
are amorphous naturally-occurring inorganic solids that lack crystallinity.
is the third hardest mineral. It is also the mineral of ruby and sapphire.
Watch out for Ticks!Ticks
are a problem for geologists in some areas. Learn to recognize and avoid them.
is a feldspar mineral that sometimes exhibits an iridescent play-of-color.
is a metamorphic rock with properties that make it suitable for a variety of projects.
- a manganese mineral used as an ore, a pink gem and an ornamental stone.
American GemstonesMined in America
- Small mines in the United States produce a diversity of beautiful gemstones.
- Learn about the properties of diamond, its many uses, and diamond discoveries.
Colored DiamondsColored Diamonds
are diamonds with a noticeable body color. They can sell for over $1M/carat.
- Colorful images and articles about diamonds and colored stones.
is a purple silicate mineral, found only in Russia, used as a gem material.
Underwater VolcanoHawaii*s Next Island
could be growing in the Pacific Ocean right now. Its name is Lo*ihi.
- The intrusive igneous rock that underlies continents and countertops.
June 6th 1912Novarupta
- The most powerful volcanic eruption of the 20th century occurred in the U.S.A.
- The rock that has quickly transformed the oil and gas industry.
What is Geology?What is Geology?
The study of Earth materials, structures, processes and life over time.
What Is The Moho?What Is The Moho?
The Mohorovicic Discontinuity is the mantle/crust boundary.
Gem SilicaGem Silica
is a blue chalcedony colored by copper. It is the rarest and most valuable chalcedony.
Ethiopian OpalEthiopian Opal
- The new opal heavyweight that might give Australia a run.
Lapis LazuliLapis Lazuli
- a metamorphic rock and the most popular blue opaque gemstone in history.
Methane HydrateMethane Hydrate
deposits contain more fuel value than all other fossil fuels combined.
Mineral RightsMineral Rights
- Who owns the minerals under your land? Who wants to buy them?
- Used as an ore of copper, a pigment, ornamental stone and gem material.
- The most important ore of copper for over five thousand years.
Grape AgateGrape Agate
is a popular mineral specimen with the color and the shape of a bunch of grapes.
Rock SaltRock Salt
is a sedimentary rock composed of the mineral halite. It has many uses!
look like ordinary rocks on the outside but can be spectacular inside!
100+ Gemstones100+ Gems
- Photos of over 100 beautiful gems ranging from the popular to the obscure.
DeLorme AtlasTopo Maps
- The DeLorme Atlas is an entire state of topo maps in one convenient book.
is the most popular green gemstone in the United States and most of the world.
Hand LensHand Lens
A 10-power folding magnifier in a metal case. A frequently used lab and field tool.
Gifts That RockGifts That Rock
- What are the most popular gift items in the Geology.com store?
- The most important ore of iron. A source of mineral pigment since prehistory.
- A bluish-green gem material that has been used for over 6000 years.
Herkimer DiamondsHerkimer Diamonds
Doubly-terminated quartz crystals used as specimens and gems.
Waterproof PaperWaterproof Paper
- Don't take chances with your field notes and maps. Use waterproof paper.
Field CoursesField Courses
- Over 80 field courses for undergraduate geology students.
Rock ArtRock Art
- People have been marking on rocks for thousands of years.
Ant Hill GarnetsAnt Hill Garnets
- tiny gems that ants haul to the surface and discard on their anthill. Honest!
- an extremely colorful mineral and gem material.
Cave of the HandsCave of the Hands
is a cave where ancient people painted hands about 9000 years ago.
is the transparent variety of quartz with a yellow to orange to reddish color.
An extrusive igneous rock with a high silica content, produced from granitic magma.
was unknown until a few decades ago but it has erupted into wide popularity.
- Rocks that were once parts of planets or large asteroids.
Plate TectonicsPlate Tectonics
- Articles and maps about plate tectonics and the interior of Earth.
Lightning Strikes MapLightning Strikes Map
by NASA shows the worldwide distribution of lightning activity.
Geology BooksGeology Books
- A variety of books for reference, field trips, reading and more.
Expansive SoilExpansive Soil
causes more damage than floods, hurricanes & tornadoes combined.
UV Mineral LampPortable UV Lamp
- Short and long wave UV for fluorescent mineral viewing.
Rocks on MarsRocks on Mars
Many of the rocks found on Mars are not very different from Earth rocks.
Largest VolcanoesLargest Volcano
- That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
is a variety of limestone formed from fine-grained marine sediment known as ooze.
Tallest WaterfallAngel Falls
in Venezuela is the tallest waterfall in the world - it is 3212 feet tall.
What is a Maar?What is a Maar?
The second most common volcanic landscape feature on Earth.
Petrified WoodPetrified Wood
is a fossil that forms when silica replaces and infills the cavities of wood.
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Fluorescent MineralsFluorescent Minerals
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Don*t Go To JailKnow the Rules
before removing rocks, fossils or minerals from public or private property.
Uses of TalcTalc
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is a chromite host rock, a source of diamonds and a possible carbon dioxide sink.
What is a Geyser?What is a Geyser?
Photos and information about geysers in many parts of the world.
- The primary ore of titanium and source of most titanium dioxide.
Mount VesuviusMount Vesuvius
- geology, history, maps, facts and more about the Vesuvius eruptions.
- Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Storm SurgeStorm Surge
can be the most damaging and deadly aspect of a hurricane.