|
| Ottrelite |
Chemical
Formula |
(Mn,Fe,Mg)2Al4Si2O10(OH)4 |
Species |
Silicates |
Mohs
Scale |
6-7 |
Specific
Gravity |
3.50 |
Streak |
Greenish, grayish |
Luster |
Vitreous to nearly adamantine on cleavages |
Refractive
Index |
n = 1.709 - 1.725 n = 1.712 - 1.726 n = 1.716 - 1.732 |
Diaphaneity |
Translucent |
Cleavage |
perfect; likely |
| Crystal Habit：Granular |
Ottrelite is a form of chloritoid. Its empirical formula is (Mn,Fe,Mg)
2Al
4Si
2O
10(OH)
4.
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