Ottrelite

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Ottrelite
Ottrelite-41820.jpg
Ottrelite
General
Category Nesosilicate
Formula
(repeating unit)
(Mn,Fe,Mg)2Al4Si2O10(OH)4
Strunz classification 09.AF.85
Identification
Formula mass 490.11
Colour 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[edit]

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External links[edit]

Media related to Ottrélite at Wikimedia Commons