Chiastolite 5 - 7 cm rough pieces.

Name: Chiastolite 5 - 7 cm rough pieces.
SKU: chias22
Price: 5.00 ZAR
Availability: InStock

94 available / new

R5.00

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SilverHillsGems1219

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Product details

Condition

New

Location

South Africa

Product code

chias22

Bob Shop ID

619656455

Chiastolite is a variety of the mineral andalusite with the chemical composition Al2SiO5. 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.

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