andalusite basalt chlorite group clay claystone dimension stone diopside dolomite feldspar garnet glaucophane gneiss graphite greek language gypsum halleflinta hematite hornblende igneous rock ironstone kyanite limestone list of minerals list of rock textures manhattan schist metamorphic rock mica mineral mud olivine phyllite public domain quartz quartz-porphyry quartzite rhyolite scapolite shale sillimanite slate staurolite talc tourmaline tremolite tuff unconformity zoisite