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Japanese nontronite localities

67 localities

A list of Japanese nontronite localities described in citable papers and books. The list is edited based on the editing policy of location lists.

Nontronite is ubiquitous as alteration products of olivines in volcanic rocks.

Year of description

Location (Prefecture, Synonym, Comments)

Year 1913

Oshima (Yamanashi, Daido-iwa, as Iddingsite)

Year 1924

Yamato mine (Yamaguchi, Ofuku mine)

Year 1928

Ganya-Higashitani (Shimane, Nakamura, Oki-Dogo)

Year 1929

Maoku valley (Shimane, Ganya, Oki-Dogo), Mutsure island (Yamaguchi, Shimonoseki, as Iddingsite)

Year 1937

Toroku mine (Miyazaki)

Year 1949

Fukuoka pref.

Year 1950

Kawamata-Suishoyama (Fukushima, as Iddingsite)

Year 1952

Kitami mine (Hokkaido, Mn), Ishibuchi mine (Hokkaido), Hoei mine (Oita, Tsuzura mine), Mount Suzugatake (Gunma, Akagi, as Iddingsite)

See Japanese page for more localities.