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Name: |
kyanite |
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Class: |
Silicates |
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Chemistry: |
Al2SiO5 Aluminum Silicate |
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Color(s): |
light blue, gray to greenish |
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Hardness: |
5.5-7.0 |
SpecGrav: |
3.41-3.67 |
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Fracture: |
uneven |
Cleavage: |
perfect |
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Crystal: |
Triclinic, tabular crystals, often not terminated, sometimes bent or twisted, often long and flattened |
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Envronment: |
high pressure metamorphic rocks low in Ca and rich in Al. |
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Association: |
garnet, staurolite and micas |
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Locals: |
| Mass, Conn., N.C., USA | Brazil | Switzerland | Austria | Italy | India | |
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Misc: |
The name comes from the Greek "kyanos", meaning "blue". The crystals are usually bladed and have a mica-like structure in one direction. It is sometimes used for the manufacture of high-temperature porcelain products. It is trimorphous with both andalustie and sillimanite. |
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Photos |
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