MN320 Sample ID MN320 • Cabinet E Common Opal 9.354cm W x 5.4cm H x 3.624cm D • 114g Sample TypeMineralColorTanLusterWaxy StreakWhiteCleavage/FractureConchoidal fractureSpecific Gravity1.965 Geographic Location/Date Mohs Hardness 6 A chunk of smooth tan-yellow common opal with the vague appearance of butterscotch saltwater taffy. It fluoresces a yellow-green under UV Light unlike saltwater taffy. Description of Mohs scale here