Ottrelite is a form of chloritoid. Its empirical formula is (Mn,Fe,Mg)2Al4Si2O10(OH)4.
| Ottrelite | |
|---|---|
 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] |
See also
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References
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Media related to Ottrélite at Wikimedia Commons
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