Abstract
Primary pyrogenetic anhydrite which occurs in volcanic rocks has not been described, except for the anhydrite from Himeshima lava. Recently, the writer found and identified the anhydrite developed in the groundmass of olivine basalt from the Rishiri volcano, Hokkaido. With regard to the genesis of the anhydrite, there is difference in opinion whether the anhydrite from Himeshima occurred as a phenocrystic (Kawano 1948) or as a groundmass mineral (Taneda 1949). The writer's studies on the anhydrite from the Rishiri volcano lead to the conclusion that this mineral was formed at the deuteric stage in the crystallization of the olivine basalt.
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