Geographic Minerals

Babefphite is a rare phosphate mineral with the general formula BaBe(PO4)(F, OH). The name is given for its composition (Ba meaning barium, Be meaning beryllium,…

Aventurine is a form of quartz, along with carnelian, amethyst, and citrine; characterized by its translucency and the presence of platy mineral inclusions that give…

Illite is a non-expanding clay crystalline mineral. It is a group of mica-type clay minerals widely distributed in marine shales and related sediments. The chemical…

Auerlite is a rare North Carolina mineral variety, remarkably rich in thoria, named after Carl Auer von Welsbach, the inventor of the Welsbach incandescent gas…

Asbestos is a naturally occurring mineral substance that can be pulled into a fluffy consistency. It is a set of six naturally occurring silicate minerals,…

Aquamarine is a blue or cyan variety of beryl. It occurs at most localities which yield ordinary beryl. The gem-gravel placer deposits of Sri Lanka…

Although anyolite is advertised as a variety of the mineral zoisite from Kenya and the Arusha Region of Tanzania, anyolite is actually a metamorphic rock…

Antozonite (historically known as Stinkspat, Stinkfluss, Stinkstein, Stinkspar and fetid fluorite) is a radioactive fluorite variety first found in Wölsendorf, Bavaria, in 1841, and named…

Grunerite is a mineral of the amphibole group of minerals with formula Fe7Si8O22(OH)2. It is the iron endmember of the grunerite-cummingtonite series. It is not…

Ammolite is a beautiful organic stone that’s formed from Aragonites inside the fossilized shells of Ammonites. It is made of the fossilized shells of ammonites,…

Amethyst is a violet variety of quartz often used in jewelry. It is a purple variety of quartz (SiO2) and owes its violet color to…

Amazonite (sometimes called “Amazon stone”) is a green variety of microcline feldspar. Is translucent to opaque feldspar gemstone with a pretty green color. It is…