Encyclopedia > Kyanite

  Article Content


The mineral kyanite is an aluminium silicate of the sillimanite group (along with andalusite and sillimanite), also called alumino-silicate. It has the formula Al2O3·SiO2 (Al2SiO5). Its hardness varies widely depending on its crystallographic direction, from 5 to 7.5, and it has a specific gravity of 3.56-3.67.

It is translucent, usually blue, but possibly white, gray, green, or black. It is usually found in long-bladed crystals or columnar to fibrous structures.

Kyanite is used in refractory and ceramic products. Noted deposits are found in Brazil, USA (North Carolina and Georgia), Switzerland, Russia, India and Kenya. Kyanite is found in such metamorphic rocks as gneiss and schist. The name "kyanite" is derived from the Greek word for "blue."

See also: List of minerals

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article

...   Contents KANU The Kenya African National Union, better known as KANU ruled Kenya for 40 years since its independence from British colonial rule in 1963. From ...

This page was created in 24.3 ms