MN820 No Image! Sample ID MN820 • Cabinet T Tourmaline 8.19cm W x 7.48cm H x 9.3cm D • 323g Sample TypeMineralColorBlackLusterShiny StreakGrayCleavage/FractureCleavageSpecific Gravity1.28 Geographic Location/Date Mohs Hardness 2 Black Tourmaline in a soft flaky mineral assumed to be mica. Description of Mohs scale here