Henmilite, Olshanskyite
Fuka mine, Bitchu-cho (Bicchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island, Japan
Thumbnail, 1.6 x 1.2 x 0.9 cm
Gemmy, deep blue crystals to 2 mm of the ULTRA-RARE copper borate henmillite nicely lined up on contrasting white matrix, which includes another ultra-rare calcium borate, olshanskyite. Henmillite of such quality is found ONLY at the Fuka Mine on Honshu Island, Japan. 1.6 x 1.2 x 0.9 cm