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Life Is Everything (faith) helps environmental conservation.

GEMSTONES (25)

 

Kyanite


A mineral used to make porcelain, as an abrasive, and occasionally as a gemstone

blue kyanite crystals

Blue kyanite crystals:A very common habit of kyanite is blue bladed crystals. Image byAelwyn, Creative Commons license.

What is Kyanite?

Kyanite is a mineral found mainly inmetamorphic rocks. It most often forms from the high-pressure alteration of clay minerals during the metamorphism ofsedimentary rocks. It is found in theschistsandgneissesof regionally metamorphosed areas and less often inquartziteor eclogite.

Kyanite's typical habit is a bladed crystal, although it sometimes occurs as radiating masses of crystals. Kyanite is often associated with other metamorphic minerals such asgarnet,staurolite, andcorundum.

Radiating kyanite

Radiating kyanite:Sometimes kyanite occurs as radiating masses of crystals such as this specimen from Petaca, New Mexico. Specimen is about 4 inches (ten centimeters) across.

Kyanite's Unusual Hardness

Kyanite specimens have a variable hardness. The long crystals have aMohs hardnessof about 4.5 to 5 if tested parallel to the length of a crystal, and a hardness of 6.5 to 7 if tested across the short dimension of a crystal. The mineral was once commonly called "disthene" which means "two strengths."

Physical Properties of Kyanite

Chemical Classification Silicate

19 Comments
:

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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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35 months ago
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