Olshanskyite, Henmilite, Calcite

Specimen ID: RRA-EG1

Mineral(s)
Olshanskyite : Ca2[B3O3(OH)6](OH)·3H2O
Henmilite : Ca2Cu[B(OH)4]2(OH)4
Calcite : CaCO3
Locality
As recorded:
Fuka Mine, Takahashi, Okayama Prefecture, Honshu Island, Japan
Mindat locality:
Dimensions
32mm x 21mm x 10mm
Description
Numerous deep blue, well formed henmilite crystals are strung across the top of the specimen, dominated by the largest crystal that reaches 3mm across. Great contrast with the matt white olshanskyite. A showy, large thumbnail (technically just reaching miniature in size) with no damage. Excellent example of henmilite from the type locality.
Previous data
Mineral(s)
Name withheld

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