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Olshanskyite: Ca2[B3O3(OH)6]OH·3(H2O) Henmilite: Ca2Cu[B(OH)4]2(OH)4
Comments: Milky white olshanskyite hosting crystals of deep blue henmilite to 6 mm across.
Location: Fuka Mine, Bicchu Town, Kawakama Co., Okayama Pref., Japan.
Scale: Crystal size 6 mm.
© John Veevaert