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forms during the regional metamorphism of clay-rich
It's found in mica schists, gneisses, and associated hydrothermal
quartz veins and pegmatites.
Kyanite's name comes from kyanos,
the Greek word for dark blue.
Kyanite is usually blue or blue-gray, but can also be green, orange, or
colorless. Kyanite's French name is disthene,
hardness, because Kyanite crystals have a Mohs hardness of
5 lengthways and 7 across.
Kyanite is an index
that helps estimate the temperature, depth, and pressure at which a
rock metamorphosed. It's used in the manufacture of porcelain
products and the linings of kilns and furnaces, as well as electrical
insulators, abrasives, and electronics.
specimens on this page are from Brazil's
famous Minas Gerais mining district.
this page, you'll receive the exact Kyanite
specimen shown in each
(On this page, you'll receive the exact Kyanite
specimen shown in
3" x 1.25" x 0.6"
2.25" x 2" x 1"
page, you'll receive the exact Kyanite
specimen shown in each photo.)
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Mother Lode Rock
PO Box 1812
Nevada City, CA 95959