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Digital Atlas of Idaho
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Digital Atlas of Idaho.iso
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mncomp.jpg
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Joint Photographic Experts Group Image
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2002-03-11
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29KB
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445x181
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16-bit (21,519 colors)
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The proportions of minerals in common igneous rocks Fine grained Rhyolite Dacite Andesite Basalt Coarse grained Granite Granodiorite Diorite Gabbro Peridotite Quartz Sodium rich ; Calcium rich 80 Plagioclase Percentage 60 of minerals Potassium by volume 40 feldspar Olivine 20 Muscovite Biotite Amphibole Pyroxene 0 COLOR OF ROCKS BECOMES INCREASINGLY DARK INCREASING SILICA CONTENT
