The Pyroxenes and Olivines from some Acid Glasses |
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| Authors: | CARMICHAEL I S E |
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| Institution: | Department of Geology, Imperial College, London, England |
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| Abstract: | The coexisting pyroxenes and olivines from nine British andIcelandic Tertiary porphyritic acid glasses have been separatedand analysed chemically. Eight new analyses of augite and ferroaugites,one of orthopyroxene, and five of iron-rich olivines are presented,together with their optical properties. The trend of crystallizationof the ferroaugites is discussed. New optical determinativecurves for these ferroaugites and the iron-rich olivines arepresented. The relationship of the pyroxenes and olivines totheir analysed residual glasses is considered. |
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