MN706 Sample ID MN706 • Cabinet H Galena 5.97cm W x 10.8cm H x 5.16cm D • 2126g Sample TypeMineralColorGreyLusterMetallic StreakGreyCleavage/FracturePerfect Cubic / SubconchoidalSpecific Gravity7.48 Geographic Location/DateJoplin, Missouri Mohs Hardness 3 This is a large specimen of Galena. It has a strong metallic luster and a visible cubic cleavage. In some regions, it has brown rock. This mineral, comprising lead and sulfur, is one of the main lead sources. Description of Mohs scale here