Andradite is the most luminous of the Garnets and contains many gemstone varieties. Andradite is a single member mineral of the Garnet group. Andradite Garnets are not commonly used as gemstones, due to lack of availability, and low hardness. Andradite Garnets can be found in green, yellow, red , orange, pink, brown,black, grey, and multi colored. The varieties of Andradite are Demantoid, Mali Garnet, Melanite, and Topazolite.
* Antimony >
Antimony almost always contains some arsenic, but may also contain traces of silver, iron, and sulfur. On a fresh or preserved surface, Antimony has a tin-white color with a slight blue tinge. Otherwise, it is dark gray due to tarnish. Specimens of native Antimony are usually rather dull and ugly, as they usually lack crystals and have a somewhat dull, tarnished surface. Antimony and Arsenic are almost identical. In many instances, the only way to tell them apart is by conducting complex scientific tests. Stibarsen, a mixture of arsenic and antimony, is also indistinguishable through common methods.
* Aquamarine >
Aquamarine is the blue to blue-green variety Beryl. Beryl also contains other gem varieties, including Emerald, Morganite, and Heliodor. The lighter colored specimens are more common. Most Aquamarine can be heat treated to remove the green hues within the stone. Aquamarine is the birthstone of March.
* Aventurine >
Aventurine is a compact variety of Chalcedony. The stone contains small inclusions or scales, that give it a glistening effect. The most common of these inclusions is Muscovite Mica, but may also be Hematite or Goethite. The most common color of Aventurine is green.
* Azurite >
Azurite 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, which may form green stains or specks on Azurite crystals or aggregates. The two minerals sometimes occur admixed or banded together, forming what is called “Azure-malachite” in the gem and mineral trades. A rarer Azurite mixture, known as “Bluebird”, is Azurite mixed with dark red Cuprite. Azurite, “Azure-malachite”, and “Bluebird” all have gem uses.
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