Home » Minerals
What Are Minerals?
Minerals are materials that meet five requirements. They are: 1) naturally occurring, 2) inorganic, 3) solids, 4) with a definite chemical composition, and, 5) an ordered internal structure.
Charoite is a purple silicate mineral, found only in Russia, used as a gem material.
Diamond: The Mineral
Diamond is a mineral with unique properties and many gem and industrial uses!
Fool*s Gold is a name used for pyrite when its brassy color fools people looking for gold.
Corundum is the third hardest mineral. It is also the mineral of ruby and sapphire.
Diopside - Gem material, ornamental stone, diamond indicator, industrial mineral.
Topaz is a mineral best known as a durable gemstone and its use in Mohs Hardness Scale.
Garnet is best known as a red gemstone. It occurs in any color and has many industrial uses.
Calcite is a carbonate mineral with industrial, agricultural, medical and many other uses.
Benitoite - discovery of the State Gem of California - USGS report from 1911.
Fluorescent Minerals glow with spectacular colors under ultraviolet light.
Vanadinite is an important ore of vanadium and a minor source of lead.
Quartz is the most abundant mineral in the crust. It has many useful properties.
Mohs Hardness Scale is a set of reference minerals used for classroom hardness testing.
Rhodochrosite - a manganese mineral used as an ore, a pink gem and an ornamental stone.
Lepidolite is a pink to purple mica used as an ore of lithium and as a gem material.
Don*t Go To Jail
Mineral collectors must know the rules for removing specimens from public and private property.
Diamonds from Coal?
Diamonds Do Not Form From Coal That is one of the biggest misconceptions in science.
Hematite - the most important source of iron ore and mineral pigment since prehistory.
Tourmaline - the most colorful mineral and natural gem material on Earth.
Olivine - Abundant in Earth*s mantle. A constituent of meteorites. The gem peridot.
Magnesite is a carbonate mineral used for chemicals, fire bricks, magnesium metal and more.
Herkimer Diamonds Doubly-terminated quartz crystals used as specimens and gems.
Kyanite is a metamorphic mineral used to make porcelain, abrasive products and gems.
Variscite is a yellowish green to bluish green mineral. It is similar to turquoise and cut as a gem.
Rhodonite - a manganese silicate used as a minor ore of manganese and as a gemstone.
Mineraloids are amorphous naturally-occurring inorganic solids that lack crystallinity.
Uses of Gold
Gold has unique properties that make it one of the most useful minerals.
Azurite - Used as an ore of copper, a pigment, ornamental stone and gem material.
Rock and Mineral Kits
Rock and Mineral Kits The most effective way to learn about rocks and minerals.
Cinnabar - the only important ore of mercury. Used in pigments until its toxicity was realized.
Serpentine - metamorphic rocks used in construction, architecture and lapidary work.
Zircon is the primary ore of zirconium and a gemstone that is available in many colors.
Tucson Mineral Show
Tucson Gem & Mineral Show Photos from the largest gem and mineral show.
Ilmenite - The primary ore of titanium and source of most titanium dioxide.
Geology Dictionary - contains thousands of geological terms with their definitions.
Chalcopyrite - The most important ore of copper for over five thousand years.
Spodumene is a pegmatite mineral, an ore of lithium and sometimes a gemstone.
United States Gemstones Small mines in the U.S. produce a diversity of gemstones.
The Streak Test is a method to determine the color of a mineral in powdered form.
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the Geology.com store?
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
The Acid Test
The Acid Test Geologists use dilute hydrochloric acid to identify carbonate minerals.
Molybdenite is the primary ore of molybdenum which is used in superalloys and as a lubricant.
Hardness Picks - Test for hardness with precise and easy-to-use hardness picks.
Tumbled Stones are rocks that have been rounded, smoothed and polished in a rock tumbler.
Rare Earth Elements
Rare Earth Elements are used in cell phones, DVDs, batteries, magnets & many other products.
Rutile - an ore of titanium; a source of titanium oxide; causes stars and eyes in gems.
Rock-Forming Minerals - most of Earth*s crust is made-up of a small number of minerals.
What Are Minerals?
Minerals are the building blocks of our society. We use items made with them every day.
Is Water a Mineral?
Are Water and Ice Minerals? Comparing their properties with the definition of a mineral.
Olivine Rain Spitzer Telescope discovered a rain of olivine crystals on protostar HOPS-68.
Uses of Silver
Uses of Silver Most people think of jewelry and coins, but silver\'s primary use is industrial.
Crystal Habit is the external shape displayed by a crystal or an aggregate of crystals.
Uses of Talc
Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products.
Rock Tumblers - All about rock tumblers and rock tumbling. Read before you buy a tumbler.
Fireworks & Minerals
The Science of Fireworks Learn how the colors and shapes are created.
Denver Mineral Show
Denver Gem and Mineral Show - Photos and comments about this incredible show.
Minerals in Colored Glass - Minerals are what produce the color in colored glass.
Mineral Rights - Who owns the minerals under your land? Who wants to buy them?
Limonite - an amorphous iron oxide. An ore of iron and a pigment since prehistory.
How Do Snowflakes Form? They start as tiny crystals. Some grow on the way down.
Gold Panning Kits
Gold Pans and Panning Kits - classifiers, snuffer bottles. Learn how to pan for gold!
Triboluminescence is flash produced when a mineral is rubbed, scratched or broken.
Abandoned Mine Accidents kill several people every year. Education can prevent deaths.
Hand Lens A 10-power folding magnifier in a metal case. A frequently used lab and field tool.