Clinohumite

Formula: Mg9(SiO4)4F2 nesosilicate (insular SiO4 groups)
Specific gravity: 3.17 to 3.35
Hardness: 6
Streak: White
Colour: Brown, yellow, white, orange, reddish brown.
Environments:

Metamorphic environments

Clinohumite is a product of contact metamorphism.
It may be found in dolostone, kimberlite, limestone and peridotite. Titanium is a minor constituent of clinohumite in most occurrences. Clinohumite is stable throughout the upper mantle to depths of at least 410 km.

Common impurities: Fe,Ti,Al,Mn,Ca,(OH)