File:South African Geology - Schwarz - 1912 Fig 10.png
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[edit]DescriptionSouth African Geology - Schwarz - 1912 Fig 10.png |
English: 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. |
Date | |
Source | File:South African Geology - Schwarz - 1912.djvu |
Author | Schwarz, Ernest Hubert Lewis, 1873-1928 |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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