Jump to content

Ottrelite

From Wikipedia, the free encyclopedia
Ottrelite
Ottrelite
General
CategoryNesosilicate
Formula
(repeating unit)
(Mn,Fe,Mg)2Al4Si2O10(OH)4
Strunz classification09.AF.85
Identification
Formula mass490.11
ColorPistachio green
Crystal habitGranular
TwinningPolysynthetic, {001}
Cleavage{001} perfect; {110} likely
Mohs scale hardness6–7
LusterVitreous to nearly adamantine on cleavages
StreakGreenish, grayish
DiaphaneityTranslucent
Specific gravity3.50
Density3.52
Dispersionr > 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]

References

[edit]
[edit]

Media related to Ottrélite at Wikimedia Commons