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Geology of Saipan, Mariana Islands; Part 2, Petrology and soils
R. G. Schmidt, J. H. Johnson, R. J. McCracken
1957, Professional Paper 280-B-D
The rocks that comprise the volcanic formations of Saipan are of two principal types: dacites, which are characteristically glassy, and andesites, which are comparatively crystalline. The dacites consist primarily of silicic glass, oligoclase, and silica minerals (quartz, tridymite, cristobalite, chalcedony, and opal). Minor constituents in these rocks are green hornblende,...