MN209 Sample ID MN209 • Cabinet U Natrolite 10.4cm W x 6.5cm H x 5.1cm D • 360g Sample TypeMineralColorWhiteLustersilky StreakwhiteCleavage/Fractureperfect 90 degreeSpecific Gravity2.64 Geographic Location/DateHorseshoe Dam. AZ. Mohs Hardness 1 spherical formations of small drusy needlelike crystals inside Dark volcanic rock Description of Mohs scale here