MN662 Sample ID MN662 • Cabinet U Galena 18.4cm W x 21.1cm H x 6.6cm D • 3680g Sample TypeMineralColorGreyLusterMetallic StreakGreyCleavage/FracturePerfect Cubic/ SubconchoidalSpecific GravityNA, Specimen too large Geographic Location/DateNA NAMohs Hardness 3 A very large specimen in a tan matrix. The crystals are grey and dull with a metallic luster. They are all very cubic. This specimen was too large to take the specific gravity, but according to multiple resources, the specific gravity should be between 7.4-7.6. Description of Mohs scale here