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| Keywords: South African Geology - Schwarz - 1912 Fig 10.png en Figure from South African Geology - Schwarz - 1912 Page 62 Fig 10 The Structures of Rocks as shown in their Sections 1 Granite acid rock all crystalline Q quartz excess of acid ; F felspar; M white mica; B black mica; P apatite lime phosphate 2 Quartz-porphyry The quartz grains alone have had time to form; they have been corroded and the matrix is volcanic glass virtually all the substances that form the other crystals in granite melted up 3 Dolerite basic rock all crystalline M Magnetite black iron ore excess of base; o olivine altering to serpentine; A augite; F felspar 4 Marble composed of crystals of calcite; a sediment recrystallized 5 A sandstone Sandgrains water-worn held together by a small amount of iron oxide which coats the grains and colours the sandstone brown Open spaces between the grains 6 Chlorite schist A recrystallized rock scales of chlorite all in more or less parallel position with grains of magnetite and quartz between 1912 File South African Geology - Schwarz - 1912 djvu Schwarz Ernest Hubert Lewis 1873-1928 other versions PD-old-70-1923 South African geology book | ||||
