5724 Jacobsite, N’Chwaning II Mine, Kuruman, Kalahari manganese field, Northern Cape, South Africa
Lustrous black octahedral crystals.
Jacobsite
7115 Jacobsite (Iwakiite), Gozaisho mine, Iwaki, Fukushima Prefecture, Tohoku Region, Honshu Island, Japan
Previously iwakiite. Now redefined as jacobsite-Q, a polymorph of jacobsite. Type Locality. ex Joan Lamond Collection.
5492 Jacobsite (Iwakiite), Gozaisho mine, Iwaki City, Fukushima Prefecture, Japan
Previously iwakiite. Now redefined as jacobsite-Q, a polymorph of jacobsite. Hiromi Yamasaki.
