Rocks Classified and Described: A Treatise on LithologyLongmans, Green, and Company, 1866 - 425 páginas |
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Página 72
... radiated pyrites , spear pyrites , hepatic pyrites , cockscomb pyrites , cellular pyrites , according to vary- ing texture . Cleavage prismatic , indistinct . Fracture uneven . Brittle . H. = 6—6 · 5 . S.G. = 72 MINERALS .
... radiated pyrites , spear pyrites , hepatic pyrites , cockscomb pyrites , cellular pyrites , according to vary- ing texture . Cleavage prismatic , indistinct . Fracture uneven . Brittle . H. = 6—6 · 5 . S.G. = 72 MINERALS .
Página 86
... TEXTURE . BASIC ROCKS ( all Igneous ) Dolerite Basalt Nepheline Rock Leucite Rock Diabase Diorite Gabbro Hyper- sthenite Melaphyre Porphyrite Silica 41.0-57 36.0-5541.0-52 | 44 · 0-54 42.0-56 46.0-63 43.0-4945.0-51 54.0-62 59-61 Alumina ...
... TEXTURE . BASIC ROCKS ( all Igneous ) Dolerite Basalt Nepheline Rock Leucite Rock Diabase Diorite Gabbro Hyper- sthenite Melaphyre Porphyrite Silica 41.0-57 36.0-5541.0-52 | 44 · 0-54 42.0-56 46.0-63 43.0-4945.0-51 54.0-62 59-61 Alumina ...
Página 87
... TEXTURE . By the term texture , as applied to rocks , we mean chiefly their physical structure , having regard to the size , shape , and mode of adhesion of their individual mineral particles . All rocks may be divided into two ...
... TEXTURE . By the term texture , as applied to rocks , we mean chiefly their physical structure , having regard to the size , shape , and mode of adhesion of their individual mineral particles . All rocks may be divided into two ...
Página 89
... texture of a rock is termed PORPHYRITIC when distinct crystals or crystalline particles are distributed through an otherwise compact principal mass or matrix . The texture of the matrix or principal mass need not , how- ever , always be ...
... texture of a rock is termed PORPHYRITIC when distinct crystals or crystalline particles are distributed through an otherwise compact principal mass or matrix . The texture of the matrix or principal mass need not , how- ever , always be ...
Página 90
... texture , which is termed slaty texture or cleavage . ( c ) By very thin parallel superposition or lamination of the fine particles of the rock . Thus a fissile tex- ture is developed in mud deposits , whether of marl , clay , or sand ...
... texture , which is termed slaty texture or cleavage . ( c ) By very thin parallel superposition or lamination of the fine particles of the rock . Thus a fissile tex- ture is developed in mud deposits , whether of marl , clay , or sand ...
Outras edições - Ver tudo
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1878 |
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1866 |
Rocks Classified and Described: A Treatise on Lithology Bernhard von Cotta Visualização integral - 1865 |
Palavras e frases frequentes
aggregates Alps amygdaloidal aphanite appear argillaceous augite basalt beds bitumen brown Browncoal calcareous calcspar carbonate character chemical chlorite clay clay-slate Cleavage coal colour Colourless columnar compact composition compound conchoidal to uneven consists contains Crown 8vo crystalline schists crystals decomposed deposits diabase diorite dolerite dolomite earth Edition felsitic felspar fibrous fine-grained foliated formation fossils Fracture conchoidal frequently fuses garnet geodes geol geological Germ gneiss grains granite granular grav greenstones grey gypsum hornblende igneous rocks imbedded iron Jahrb labradorite lavas leucite lime limestone Lustre vitreous magnesia magnetic iron-ore marl mass massive matrass matrix melaphyre metamorphic mica mica-schist mineral muriatic acid occurs oligoclase opaque origin orthoclase oxide plutonic porphyritic pyrites pyroxene quartz quartz-porphyry resinous rock-salt sandstone Saxony schists sedimentary rocks serpentine shale silica slaty soluble sometimes strata sulphuric surface syenite texture trachyte transition translucent transmutation Transparent tufa usually varieties veins vesicular cavities volcanic Woodcuts
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