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Name: |
epidote |
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Class: |
Silicates |
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Chemistry: |
Ca2(Al,Fe)Al2O(SiO4)(Si2O7)(OH) hydrous calcium iron aluminum silicate |
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Color(s): |
green, yellow, gray, Streak: gray |
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Hardness: |
6 - 7 |
SpecGrav: |
3.25 - 3.5 |
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Fracture: |
conchoidal |
Cleavage: |
complete |
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Crystal: |
monoclinic (typically elongated columns) |
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Envronment: |
metamorphics, pegmatites, in felsec igneous rocks containing calcium |
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Association: |
actinolite, idocrase, augite, hornblende, apatite, quartz |
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Locals: |
| Austria | Bulgaria | France | USSR | Norway | Texas, Michigan, California/USA | |
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Misc: |
The name from the Greek words "epi" and "didonai", "to give"-"over", apparently in reference to one side being larger than the others in many crystals. |
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