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wigmund: From Mindat.Org Photo Of The Day; October 16, 2016: Quartz (Var: Smoky Quartz): SiO2; Microcline: K(AlSi3O8) Locality: Mount Malosa, Zomba District, Malawi Smoky quartz crystals on microcline from Mount Malosa. The crystals possess roughened steep rhombohedral faces ( probably … Continue reading