Everything about Chiastolite totally explained
The
mineral chiastolite is a variety of
andalusite with the chemical composition Al
2SiO
5. It is noted for distinctive cross-shaped black inclusions of
graphite. In areas around
Georgetown, California, metamorphosed sediments contained andalusite and chiastolite in a graphite rich metasediment. The chiastolite crystals have been
pseudomorphically altered by a mixture of
muscovite,
paragonite and
margarite. The calcium rich margarite tends to form along the graphite rich crosses or bands within the chiastolite. Mineralogically the occurrence is important because all three
white mica phases are present in an equilibrium assemblage.
Further Information
Get more info on 'Chiastolite'.
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