Geographic Minerals

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…

The alums are a class of chemical compounds. Alums are double sulfate salts, with the general formula AM(SO4)2·12H2O, where A is a monovalent cation such…

Amber is fossilized tree resin, which has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present…

Alexandrite The alexandrite variety displays a color change dependent upon the nature of ambient lighting. Alexandrite, with its chameleon-like qualities, is a rare variety of…

Alabaster is a mineral or rock that is soft and often used for carving, as well as being processed for plaster powder. It is compact…