Metamorphosed sedimentary (bedded) manganese ore. Rhodonite was the main ore mineral, with lesser amounts of braunite and tephroite.
References:
Matsubara, S., Miyawaki, R., Kato, A., Matsuyama, F., Mouri, T. and Suzuki, Y. (2001): Arseniopleite from the Gozaisho mine, Fukushima Prefecture, Japan. Bull. Natn. Sci. Mus., Tokyo, Ser. C, 27, 51-62.
Satoshi Matsubara et al (1996) Romeite from the Gozaisho mine, Iwaki, Japan. Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
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Map Reference: 36°59'45"N , 140°42'25"E
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Mineral List:52 entries listed. 51 valid minerals. 1 type locality (valid mineral). 1 erroneous literature entry.
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