Minerals and how They Occur: A Book for Secondary Schools and Prospectors

acid angle animals apatite aqueous rocks bead beds blowpipe borax boulders calcite calcium carbonate Cambrian cement character characteristic charcoal chemical clay cleavage coal Cobalt color common commonly compact composition compounds contain copper corundum crust crystalline limestone crystals deposits Devonian Diabase dikes earth fault feldspar fissure flame fossils fragments frequently fused gabbro galena Geology glass gneiss gold grains granite graphite gypsum hardness heat hematite hornblende Hudson River Hudson River Formations Huronian igneous rocks iron kaolinite known Lake less lime limestone lustre magnetite mass material Mesozoic metal metamorphic mica minerals and rocks molten Niagara Formation occurs Ontario orthoclase outcrops oxide percentage plants platinum plutonic rocks pre-Cambrian pyrites pyroxene quartz reader represented salt sand sandstones seen shale shown silica Silurian solution specific gravity specimens streak structure substances sulphates sulphides sulphur surface syenite Trenton and Hudson Trenton Formation usually varieties vein volcanic zinc