Ferro-anthophyllite

minerals

inosilicate

amphibole

Formula: Fe2+2Fe2+2Si8O22(OH)2 inosilicate (chain silicate), amphibole, polymorph of grunerite
Specific gravity:
Hardness: 5½ to 6
Streak: White to greyish white
Colour: Clove-brown to dark brown, grey to white, pale green
Environments

Metamorphic environments

Localities

The type locality is the Tamarack and Custer Mine, Placer Center Mining District, Shoshone county, Idaho, USA, which is hosted in quartzite (Mindat).

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