宮城県丸森町大張二十二田ペグマイト産のフエルグソン石及びゼノタイム
1957 年 41 巻 6 号 p. 211-216
詳細
1957 年 41 巻 6 号 p. 211-216
Fergusonite and xenotime occurred as single crystals, smaller than 4mm in size, associating with lepidomelane in plagioclase at the marginal part of the pegmatite. Fergusonite: the base {001} and the pyramid {111} are the dominant faces. Specific gravity G _??_=5.681 From the result of chemical analysis, shown in table 1, the chemical formula is calculated as (Y0.97R0.07)1.04 ((Nb, Ta) 0.93R0.07)1.00O4.03. Xenotime: the dominant face is z{101}, specific gravity G _??_=4.450. The chemical formula is given as (Y0.90R0.10) 1.00 (P0.91Si0.09) 1.00O3.84'
