MN323 Sample ID MN323 • Cabinet E Orthoclase 6.74cm W x 9.791cm H x 4.517cm D • 438g Sample TypeMineralColorGreyLusterPearly StreakWhiteCleavage/FracturePerfect cleavageSpecific Gravity2.607 Geographic Location/DateTempleton Ontario Canada Mohs Hardness 6 A chunk of blue-grey mineral with some white along the cracks. The cleavage is perfect at 93° and 87° angles. (Possibly rhombohedral?) This is abnormal for Orthoclase. Unclear if the label on it saying "1897" was a catalogue number or date. Description of Mohs scale here