Azurite [Cu 3 (CO 3 ) 2 (OH) 2 ] is a copper carbonate mineral. It owes its name to its beautiful azure-blue color,which makes it a very popular and well-known mineral. It usually occurs with green Malachite, whichmay form green stains or specks on Azurite crystals or aggregates. The two minerals sometimes occuradmixed or […]

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Amazonite

A variety of Microcline that is a member of the Feldspar mineral group. Amazonite is a potassium aluminum silicate mineral. Its color is usually blue, green, or bluish-green. Amazonite often has white lines or alternating streaks mixed in and can have uneven color distribution. The imperfections in color are often caused by inclusions of white […]

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tourmaline boron silicate minerals

Tourmaline is a birthstone for October, along with opal. “Tourmaline” is the name of a large group of boron silicate minerals. These minerals share a common crystal structure (Trigonal) and similar physical properties but vary tremendously in chemical composition. They share the elements silicon, aluminum, and boron, but contain a complex mixture of other elements […]

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