Smoky Quartz Specimen with Albite and Muscovite

564g / 1.243lbs / 19.89oz 4.08" x 4.68" x 4.63"  Smoky Quartz is a variety of Quartz, a silicon dioxide mineral with a hardness of 7. Like other Quartz crystals, Smoky Quartz has a hexagonal (trigonal) crystal system and forms in prisms. Smoky Quartz can vary in color from very pale tan to deep chocolate brown. Its color comes from natural irradiation. Clear Quartz can be made Smoky artificially by treating it with radium or x-rays. Albite belongs to the Plagioclase Feldspar group, an isomorphous solid solution series with a hardness of 6 to 6.5 and the crystal system of Triclinic. Albite is a widely distributed white feldspar commonly found in granites, syenites, rhyolites, and trachytes, as well as pegmatites and spillites. Because albite is the last of the feldspars to crystallize from molten rock, it may often be found with other rare minerals. Muscovite is a potassium aluminum silicate mineral with a hardness of 2.5 to 4. Its crystal system is monoclinic. It forms most frequently