MN821 No Image! Sample ID MN821 • Cabinet T Biotite 9.6cm W x 3.48cm H x 6.22cm D • 267g Sample TypeMineralColorWhite and BlackLusterShimmery StreakWhiteCleavage/FractureCleavageSpecific Gravity2.4 Geographic Location/DateOntario, Canada Mohs Hardness 2 Crystals both white and black in many different directions. Description of Mohs scale here