Henmilite coated by Calcite and on Olshanskyite (Ref: TFB64AP8)

Crystals of Henmilite, a rare hydrated borate of Ca and Cu, on an Olshanskyite matrix. They are very sharp and are very intense blue in color despite being partially covered by a thin layer of a mixture of minerals, among which Calcite predominates and among which there is also a currently unidentifiable copper silicate, and it can not be ruled out that it could be a new mineral phase.
The analyses carried out attest to this mixture of species in the coating. We will send a copy of the analysis to the buyer.
The specimen is from the type locality for the species.
Fuka Mine, Fuka, Bicchu-cho (Bitchu-cho), Takahashi, Okayama Prefecture, Chugoku Region, Honshu Island  Japan

Specimen size: 4.8 × 2.4 × 1.7 cm = 1.89” × 0.94” × 0.67”

Main crystal size: 0.7 × 0.4 cm = 0.28” × 0.16”