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Name: |
zoisite |
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Class: |
Silicates |
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Chemistry: |
Ca2Al3[Si3O12 (OH) |
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Color(s): |
gray, yellowish brown, greenish, pink (thulite), blue (tanzanite) |
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Hardness: |
6-6.5 |
SpecGrav: |
3.2-3.4 |
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Fracture: |
conchoidal |
Cleavage: |
one good |
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Crystal: |
Orthorhombic; long prismatic, deeply striated, columnar, bladed, fibrous |
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Envronment: |
only in metamorphic rocks |
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Association: |
hornblende, almandine, glaucophane, wollastonite |
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Locals: |
NC. CA., TN., CO., USA / Tanzania / Italy / USSR /Austria / Switzerland |
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Misc: |
named for Baron S. Zois van Edeltein (1747-1819), thulite named for Thule and ancient name for Norway, Tanzanite for the local Tanzania |
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Photos |
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1.) Tanzania, Africa |
3.) Tanzania, Africa |
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