The Geology and Petrography of Crater Lake National Park, Ausgaben 105-107U.S. Government Printing Office, 1902 - 167 Seiten |
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abundant allotriomorphic analysis Anna Creek apatite appear augite microlites basalts brachypinacoid brown glass brownish canyon Cascade Range cavities color colorless conspicuous contain Crater Lake crest dacite dark-colored secretions described Desert Cone developed diameters dike Diller distinctly Eagle Cove edge eruption extinction angles feet feldspar fragments glacial glass base glass inclosures glass inclusions globulites grains granophyric granular groundmass hand specimen holocrystalline hornblende hyalopilitic hypersthene hypersthene and augite hypersthene-andesite hypocrystalline andesites hypocrystalline type inclosures interstitial basalts irregular Klamath lava lithoidal Llao Rock magnetite Magnified mass microscope miles millimeter mineral minute Mount Mazama nearly numerous occurs olivine parallel pinacoid plagioclase crystals plagioclase laths plagioclase phenocrysts pleochroism polarized light portion present prismatic prisms pseudobrookite pumice pyroxenes quartz rectangular Red Cone refraction resemblance resorption roundish Sand Creek sanidine seen slender slope spherulites subtype summit Sun Creek thin section Trace tridymite twinning usually vitrophyric volcanic Wizard Island zonal