MN407 Sample ID MN407 • Cabinet F Tourmaline 6.976cm W x 4.542cm H x 5.095cm D • 166g Sample TypeMineralColorBlackLusterVitreous StreakColorlessCleavage/FractureIndistinct/unevenSpecific Gravity3.19 Geographic Location/DateClark's Ledge Mohs Hardness 8 Large uneven chunk of black tourmaline incased with small quartz crystals. Prismatic crystals with massive habit. Description of Mohs scale here