A Guide to the Determination of Rocks: Being an Introduction to Lithology

Accessory elements Accidental minerals Alumina Amphibole argillaceous attacked by acids Augite Basalts blackish blow-pipe Breccia brown Calc-spar Calcareous Calcite Calcium carbon cavities cement Chlorite clay cleavage closed tube Cloth colorless compact conchoidal fracture Conglomerate crystalline crystals deep green Delesse density deposits Diorite Dolomite earthy effervescence enamel Engineers Epidote Eurite exhibits Feldspar fibrous formed fragments friable fuses Garnet globule globuliferous Gneiss grains granite granular gray grayish greasy lustre green color greenish hardness heated hexagonal Hornblende hydrochloric acid Illustrated infusible insoluble Labradorite lamina layers less Lime Limestone Magnesia magnetic Magnetite Marl masses Melaphyres Mica Mica Schist Micaceous microscope nodules Oligoclase Orthoclase oxide of Iron paste pearly Peridot Phonolite porous Porphyry powder Protogine Pumice Pyrites Pyroxene Quartz reddish rhombic base sandstone Schist schistose scoriaceous scratched Silica slates slightly soluble in acids sometimes steel point sulphuric acid Syenite Talc texture Tourmaline Trachytes varieties vitreous yellow yellowish yields