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Name: |
sillimanite (fibrolite) |
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Class: |
Silicates |
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Chemistry: |
Al2SiO5 Aluminum Silicate |
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Color(s): |
gray-white, brown, greenish-brown |
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Hardness: |
6 - 7 |
SpecGrav: |
3.2 - 3.3 |
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Fracture: |
uneven |
Cleavage: |
perfect one direction |
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Crystal: |
orthorhombic -usually fibrous, columnar |
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Envronment: |
a metamorphic mineral found in shists, |
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Association: |
biotite, quartz, almandine |
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Locals: |
| MA, CN, SC, USA | Germany | Austira | Italy | Brazil | S. Africa | |
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Misc: |
Named after Benjamin Sillman, first professor of Mineralogy at Yale. |
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Photos |
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3.) unknown |
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