Calc-silicate skarn, of the same origin and not far from the more famous Fuka mine in neighboring Okayama prefecture, although Kushiro's mineralogy is much less complex.
Ref.: Henmi, C., Kawahara, A., Henmi, K., Kusachi, I., and Takeuchi, Y. (1983) The 3T, 4T and 5T polytypes of the wollastonite from Kushiro, Hiroshima Prefecture, Japan. American Mineralogist: 68: 156-163.
Henmi, C., Kusachi, I., and Henmi, K. (1994) Vesuvianite from Kushiro, Hiroshima Prefecture, Japan. Abstracts General Meeting International Mineralogical Association Pisa, Italy, 172.
