Crystalline Kyanite from The Mesa, Minas Gerias, Brazil
This is a very large, and very beautiful Crystalline Kyanite, from a new find, in a place called The Mesa, north of Capelinha, in Minas Gerias, Brazil. I personally, have never seen Kyanite crystals that are this translucent! Parts of this crystal are denser than others, but it's very gemmy and it's absolutely beautiful!
77.9 grams 177.91mm x 27.67mm x 9.68mm
"Kyanite is a typically blue silicate mineral, commonly found in Aluminium-rich Metamorphic Pegmatites and/or Sedimentary Rock. Kyanite in metamorphic rocks generally indicates pressures higher than four kilobars. Although potentially stable at lower pressure and low temperature, the activity of water is usually high enough under such conditions that it is replaced by hydrous Aluminosilicates such as Muscovite, Pyrophyllite, or Kaolinite. Kyanite is also known as Disthene, Rhaeticite and Cyanite.
Kyanite is a member of the aluminosilicate series, which also includes the polymorph andalusite and the polymorph sillimanite. Kyanite is strongly anisotropic, in that its hardness varies depending on its crystallographic direction. In Kyanite, this anisotropism can be considered an identifying characteristic.
Kyanite is used primarily in refractory and ceramic products, including porcelain plumbing fixtures and dishware. It is also used in electronics, electrical insulators and abrasives.
Kyanite has been used as a semiprecious gemstone, which may display Cat's Eye chatoyancy, though this use is limited by its anisotropism and perfect cleavage. Color varieties include recently discovered Orange Kyanite from Tanzania. The orange color is due to inclusion of small amounts of Manganese (Mn3+) in the structure."
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