稀元素鑛物の研究 (其の 13) : 滿洲錦州縣綏中及び環海寺産ベタフ石に就いて

概要

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The present research was carried out with betafite accompanied with pegmatites distributed in chin-chou (錦州) region, South Manchuria., The Specimens were donated by Dr., H., Kuno and Mr., Y., Nonaka, whose kindness is gratefully acknowledged., The external crystal form is combined with octahedron and rhombic dodecahedron., The chemical analysis showes that the composition of the mineral is nearly corresponds to a general formula XZ 3 (O, OH) 9 which was proposed by F.,Machtschki for the minerals of betafite group., X-ray studies were carried out with the specimens of original and ignited mineral; the indexed powder pattern data of the former coincide with those of anatase and the latter with rutil and pyrochlore., By using its contents of Pb, U and Th, the age of this mineral is determined as 7.,55×10^8 years.,
日本地質学会の論文
1951-05-31