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...A description of some oregon rocks and minerals r ocks lfr e t le mk f h l reprinted august so state i extension department geology mineral industries university service contents introduction rock descriptions general igneous defined extrusive flow lavas basalt andesite classification rhyolite identification obsidian pyroclastic pumice sedimentary cinders metamorphic tuff intrusive granite from which metals are derived diorite bauxite gabbro chalcopyrite peridotite group chromite cinnabar clastic galena shale garnierite sandstone gibbsite conglomerate gold ore unconsolidated sediments hematite clay ilmenite sand limonite chemical precipitates organic material magnetite travertine manganite psilomelane pyrolusite evaporites molybdenite diatomite pyrite limestone pyrrhotite coquina sphalerite coal stibnite zircon nonmetallic foliated agate slate asbestos schist barite gneiss calcite nonfoliated gypsum argillite realgar orpiment marble rhodonite quartzite...