// Workers AI · dad joke modeWhat did Ottrelite say to its friend? "Let's bond.

Ottrelite
Ottrelite
General
Category	Nesosilicate
Formula	(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

Ottrelite is a form of chloritoid. Its empirical formula is (Mn,Fe,Mg)₂Al₄Si₂O₁₀(OH)₄.

See also

• List of minerals

External links

Media related to Ottrélite at Wikimedia Commons