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In southwest Japan, some pyroxene-bearing metasomatic syenitic rocks occur in granitic rocks. These pyroxenes were separated and analysed chemically. Three analyses of ferrosalite and aegirine-augite,... two of hedenbergite and one of aegirine are presented, together with their optical properties, X-ray data and the outline of occurrence. The chemical compositions of the syenitic rocks and the associated granites are also presented. The conditions of formation of the pyroxenes are briefly discussed.show more
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0701_p025