A hydrated oxide of chromium as a pseudomorph after eskolaite, Outokumpu, Finland

[摘要] A new chromium mineral, hydrated oxide of chromium, has been identified as a pseudomorph after eskolaite, C2O3 in the Outokumpu orebody. Electron microprobe analyses suggest the formula as 2 (Cr1.77V0.16Al0.04Fe0.03O3 • 3(H2O) The mineral is orthorhombic, a0 = 5.918 Å, b0 = 8.610 Å, c0 = 9.727 Å, Z = 4, V = 495 Å3; and D calc = 4.81 g/cm3;.