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Albite is one of the feldspars frequently found in the manganese ore deposits in Japan. It occurs intimately associated with quartz and/or carbonate minerals usually veinlets cutting the manganese ore... or the wall rock. The results of X-ray studies and chemical analyses indicate that all these albites belong to a low temperature form and their chemical compositions are much similar to each other. They fall nearest to the Ab end of the Ab-An-Or series. On the basis of their modes of the occurrence, we can classify the feldspars from the manganese ore deposits in Japan into two types: (1) hydrothermal vein type (albite, adularia, barian-adularia or hyalophane) (2) pegmatitic vein type (microcline, orthoclase or perthite).続きを見る
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