Rocks Classified and Described: A Treatise on Lithology

accessory ingredients acid admixture Alps amygdaloidal aphanite appear argillaceous augite basalt beds bitumen brown Browncoal CALCAIRE calcspar carbonate cavities character chemical chlorite clay clay-slate cleavage coal colour compact compound consists Contains silica Crown 8vo crystalline schists crystals of felspar d. d. geol Delesse deposits diabase diorite dolerite dolomite dykes earthy felsitic felspar fibrous fine-grained fissile foliated formation frequently garnet Geogn geological Germ gneiss grains granite granular granulite grav greenstones grey gypsum hornblende igneous rocks imbedded iron Jahrb labradorite laminæ layers leucite lime limestone Lustre magnesia magnetic iron-ore MARL matrix melaphyre metamorphic mica mica-schist micaceous mineral Naumann nepheline occurs oligoclase origin orthoclase oxide perlite plutonic porphyritic pyrites pyroxene quartz quartz-porphyry sandstone sanidine Saxony schists sedimentary rocks serpentine shale silica slate slaty sometimes Spec strata stratified surface syenite talc trachyte Trachyte-porphyry transition transmutation tufa usually Varieties in Composition Varieties in Texture veins vesicular vitreous volcanic Zeitschr