Abstract
In a pegmatite croped in Kobe-mura, Kyoto prefecture, Japan, one of the writers (Takubo) had found a new mineral associated with rare element minerals such as tscheffkinite, allanite, monazite and xenotime., This mineral is prismatic in habit and the crystals are grouped in twin-like forms., Color black and luster vitreous., The chemical composition is expressed by a meta-titanate, niobate formula as shown as RIIO·2RIII 2O 3·5(TiO 2+SiO 2+Nb 2O 5+Ta 2O 5)·2H 2O=RII[RIII(OH)] 4[(Ti, Si)O 3, [{Nb, Ta)O 3} 2] 5 and it nearly corresponds to the general formula proposed by F., Machatschki for euxenite-polycrase and priorite-blomstrandite series., The content of TiO 2 is, however, exceedingly high compared with that of polycrase or blomstrandite., So the writers propose here to call this mineral "Kobeite" after the name of the locality.,
