MN640 Sample ID MN640 • Cabinet A Rhondochrosite on Quartz 11cm W x 8.1cm H x 9.3cm D • 836g Sample TypeMineralColorPink, with grey QuartzLusterPearly StreakWhiteCleavage/FracturePerfectSpecific Gravity2.76 Geographic Location/DateSilverton, CO Mohs Hardness 4 A few small, square-shaped pink crystals within quartz. The quartz is a dull grey. The pink crystals have a white streak. The specific gravity of this sample is 2.7, which is lower than it should be, a 3.7. This is most likely because the sample is mostly quartz in its matrix, with only a few rhondochrosite crystals. Description of Mohs scale here