NYF-type pegmatite.
Ref.: Nagashima, O. and Nagashima, K. (1960) Allanite. In: The Rare-Earth Minerals of Japan. Chigakukenkyu-Kai, Kyoto, Japan: 173-184 (in Japanese).
Yamada,S., Okamoto, A., Takada, M., Fujiwara, T., and Takeura, M. (1980) On the thortveitite, fluocerite, pyroxferroite and other minerals from the Isanago mine, Ōro, Nakagun Kyoto Prefecture. Chigaku Kenkyu: 31: 205-222 (in Japanese).
Hoshino, M., Kimata, M., Shimizu, M., Nishida, N., and Fujiwara, T. (2006) Allanite-(Ce) in granitic rocks from Japan: Genetic implications of patterns of REE and Mn enrichment. Canadian Mineralogist: 44: 45-62.