Chemical composition of bakerite from Fuka, Okayama Prefecture, Japan
1994 年 17 巻 3 号 p. 111-117
詳細
1994 年 17 巻 3 号 p. 111-117
Bakerite has been found as a vein-forming mineral in crystalline limestone near gehlenite-spurrite skarns at Fuka, Okayama Prefecture. The wet chemical analysis, EPMA, and IMA of the mineral yield an empirical formula Ca8.036B9.963Si6.033O30.092(OH)9.908 on the basis of O=40. The present data supports the chemical formula calculated by Palache et al. (1951) rather than that for natural specimens given by Giles (1903); Kramer and Allen (1956); Baysal and Dilekoz (1975). The DTA and TG curves, and IR spectrum are also measured. The optical and X-ray diffraction properties agree with previous data.
Bakerite from Fuka may be primarily formed under a low temperature hydrothermal condition.
