Ottrelite | |
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![]() Ottrelite | |
General | |
Category | Nesosilicate |
Formula (repeating unit) | (Mn,Fe,Mg)2Al4Si2O10(OH)4 |
Strunz classification | 09.AF.85 |
Identification | |
Formula mass | 490.11 |
Color | Pistachio green |
Crystal habit | Granular |
Twinning | Polysynthetic, {001} |
Cleavage | {001} perfect; {110} likely |
Mohs scale hardness | 6–7 |
Luster | Vitreous to nearly adamantine on cleavages |
Streak | Greenish, grayish |
Diaphaneity | Translucent |
Specific gravity | 3.50 |
Density | 3.52 |
Dispersion | r > v, strong |
References | [1][2][3] |
Ottrelite is a form of chloritoid. Its empirical formula is (Mn,Fe,Mg)2Al4Si2O10(OH)4.
See also
References
External links
Media related to Ottrélite at Wikimedia Commons