Ottrelite
(Mn,Fe,Mg)2Al4Si2O10(OH)4Strunz 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] Borates Carbonates Oxides
Phosphates Silicates Sulfides Other
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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
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Simple | |
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Mixed |
- Axinite (borosilicate)
- Geigerite (arsenate)
- Manganese nodule (various)
- Samsonite (sulfosalt)
- Zincobotryogen (sulfate)
- Wolframite (tungstate)
- Hübnerite (tungstate)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Am%C3%A9thystre_sceptre2.jpg/23px-Am%C3%A9thystre_sceptre2.jpg)
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