Abstract
Kinoite was found in a dump at the Fuka mine, Okayama Prefecture, Japan. It occurs as aggregates of flaky crystals, and rarely as subhedral platy crystals up to 1 mm wide in a vein cutting into crystalline limestone. Associated minerals are stringhamite, calcite and an unidentified mineral. The empirical formula of the mineral is (Ca2.00Mg0.02)Σ2.02(Cu1.92Fe0.04Co0.04)Σ2.00Si2.98O10·2.25H2O on the basis of O=10 (anhydrous). The unit cell parameters are a=6.989 (1), b=12.904 (2), c=5.659 (1)Å, and β=96.15 (2)°. The mineral is optically biaxial negative with refractive indices α=1.642 (2), β=1.662 (2), and γ=1.675 (2). The Vickers microhardness is 536 kg mm−2 (50 g load) and the density is 3.14 g cm−3. It is likely that kinoite at the Fuka mine was formed as a primary mineral by a reaction of Cu- and Si-bearing fluids with limestone.
