Petralogy. A Treatise on Rocks, Volume 1

abundant alabaster Alps amianthus ancient appearance argil argillaceous argillite Aspect basalt basaltin beautiful beds belong bricia brown calcareous calcareous spar called cement chalcedony characters chiefly chlorite clay slate colour columns compact composed contains cornéenne crystallised crystals of felspar Dolomieu earth feet felsite felspar ferruginous fracture fragments garnets glutenite gneiss grains granite granular green porphyry greenish grey grunstein gypsum hard hornblende Intrites iron isle jasper kind Kirwan Klaproth laminar lava layers lime limestone Lustre magnesia marble masses mentioned metallic mica mica slate mineral mineralogy mingled mixture MODE Mont mountains nature observed occurs ollite Opake ophite Patrin pebbles petrosilex porphyry present primitive pudding-stone pyrites quarries quartz reddish resembling rock sand sand-stone Sauss Saussure Saxony schistose schistus schorl Scotland serpentine siderite siderous silex siliceous soft sometimes species spots steatite stone STRUCTURE substance summit tains talc texture translucent trap unctuous veins volcanic Werner yellow yellowish