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Name:
Kyanite
Derivation:
From "kyanos" (Greek) blue
Formula:
Al
2
SiO
5
Description:
Blue bladed crystals
Kyanite is able to withstand high temperatures. It is used for porcelains, high-temperature bricks and spark plugs.
Kyanite is also called Disthene (Greek for two strength) because it has different hardnesses in different directions.
Larger pictures of Kyanite:
Single crystals
A jumble of crystals