Rocks and Rock Minerals: A Manual of the Elements of Petrology Without the Use of the Microscope, for the Geologist, Engineer, Miner, Architect, Etc., and for Instruction in Colleges and SchoolsJ. Wiley & sons, 1908 - 414 pagina's |
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acid alkalies alteration alumina amount basalts beds biotite blowpipe breccias calcite carbonate character chemical composition chiefly chlorite clay cleavage color common compact composed contain crystal form crystalline dark dense deposits described dikes diorite dolerite dolomite epidote especially feldspar felsite ferromagnesian minerals fracture gabbros garnet geological glass gneisses granite granular gray green groundmass gypsum H₂O heated hematite hornblende hydrochloric igneous rocks important intrusive iron laccoliths lavas lens less lime limestones limonite luster magma magnesia marble material megascopic mentioned metamorphic rocks mica mica-schist microscope mineral composition mineral grains muscovite nephelite occur olivine origin orthoclase oxides particles pegmatite peridotites petrographers phenocrysts porphyries present prisms produced pyroxene quartz quartzite rare regions rock masses sandstones schistose schists scratched sedimentary rocks seen serpentine shales silica SiO2 soluble solution sometimes specific gravity stratified structure substance surface syenite texture tourmaline usually varies varieties volcanic zone