Often called Wild Horse
Turquoise, Magnesite is not really turquoise but a mixture of Magnesite and
hematite. Discovered fairly recently in the 1990's in southern Arizona in
the Gila wilderness area it is a beautiful and popular stone. This stone is
characterized by its creamy white color against a darker matrix of which can
be red, brown, green, or black. The black variety is known as White Buffalo.
It is also known as Viper Jasper
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Is easily recognized by it’s
bands of light and dark green which are formed in stalactites it’s massive
carvable form is well known. There is a much rarer crystalline form which is
chatoyant. Malachite pseudomorphs the mineral azurite, replacing the
original material, when this process is incomplete it results in
azurite-malachite. Azurite-malachite has patches of both the dark blue
azurite and the green malachite.
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Marcasite Cabochons Marcasite is a very heavy metallic mineral that is sometimes found in an
agate matrix as in Marcasite from Nipomo, California. Marcasite in agate
polishes like agate and makes wonderful jewelry. Marcasite has the same
chemical formula as Pyrite, but crystallizes in a different crystal system,
thereby making it a separate mineral. Often mislabeled because the
difference is not apparent without complex analysis.
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