Carpholite

Formula: Mn2+Al2Si2O6(OH)4 inosilicate (chain silicate)
Specific gravity: 3.0
Hardness: 5 -5½
Streak: White
Colour: Straw-yellow
Environments:

Metamorphic environments
Hydrothermal environments

Carpholite occurs in hydrothermal veins in tin deposits. It is a mineral of the eclogite facies.