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Name: |
augite |
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Class: |
Silicates |
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Chemistry: |
(Na,Ca,Mg,Fe2,Ti,Al)2[(AL,Si)2O6 mixed metal aluminum silicate |
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Color(s): |
green, black, brown, rarely colorless |
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Hardness: |
5 - 6 |
SpecGrav: |
3.2 - 3.6 |
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Fracture: |
conchoidal |
Cleavage: |
incomplete |
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Crystal: |
Monoclinic (often short prismatic) twinning and striations common - well formed crystals are rare. |
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Envronment: |
found in nepheline syenite, and some carbonates. |
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Association: |
hornblende, feldspars, biotite, olivine |
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Locals: |
| Oregon, Colorado, New York, USA | Canada | Italy | Greenland | India | Pakistan | |
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Misc: |
Name comes from the Greek "augites", meaning "brightness" because of its bright, vitreous luster. Not affected by acids. |
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Photos |
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