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Calciopetersite, ideally CaCu6((PO4)2(PO3OH)(OH)6)•3H2O, occurs in cavities in quartz veins at an abandoned quarry near Domašov nad Bystřicí, 20 km northeast of Olomouc, northern Moravia, Czech Republic. It forms translucent to transparent minute acicular crystals, up to 0.4 mm in length and 5-20  m in width, with a hexagonal outline, clustered in fi ne radiating sprays (up to 0.1  0.5 mm). It is soft and brittle with an uneven fracture, but the hardness and density could not measured; no cleavage was observed. It has an olive green color, light olive green streak and vitreous luster. No fl uorescence was observed in ultraviolet light. It originated by weathering of chalcopyrite and other copper sulfi des and is associated with chrysocolla, the Ce-dominant analogue of petersite-(Y), malachite, allophane, goethite, lepidocrocite, chalcopyrite, pyrite, covellite, chalcocite and quartz. The name calciopetersite denotes that it is the Ca-dominant analogue of petersite-(Y). Calciopetersite is hexagonal, space group P63/m inferred from the isotypic agardite-(Y) and mixite, a 13.284(4), c 5.902(4) Å, V 902.0(6) Å3, Z = 2, and Dcalc 3.332 g/cm3. The strongest eight lines in the powder-diffraction pattern (d in Å(I)(hkl)) are: 11.51(100)(100), 4.346(88)(210), 4.140(46)(201), 3.837(38)(300), 3.321(44)(220), 2.888(53)(221), 2.877(37)(400), and 2.510(37)(140). Calciopetersite is uniaxial positive, with indices of refraction  1.674(5) and  >1.739 (~1.75) in Na light (590 nm), and dichroic: light green with yellowish tint (O) and green (E) with  >  . Chemical analyses yielded the average composition K2O 0.09, CaO 4.39, CuO 51.25, Y2O3 1.61, La2O3 0.64, Ce2O3 1.98, Pr2O3 0.25, Nd2O3, 1.40, Dy2O3 0.33, Yb2O3 0.21, Bi2O3 0.09, SiO2 0.52, P2O5 20.98, As2O5 2.70, H2O (12.45), total (98.89) wt.%, corresponding to (Ca0.58Y0.13Ce0.11Nd0.08La0.04K0.02Dy0.02Pr0.01Yb0.01) 1.00 (Cu5.90Ca0.14) 6.04 ((PO4)2.06(PO3OH)0.65(AsO4)0.22(SiO4)0.22(OH)6)•3.00 H2O on the basis of 21 atoms per formula unit. The ideal formula CaCu 6((PO4)(PO3OH)(OH)6)•3H2O requires CaO 6.50, CuO 55.28, P2O5 24.66, H2O 13.57, total 100.00 wt.%. The Gladstone-Dale compatibility index, calculated from incomplete optical data, is poor (-0.080). We provide a tentative interpretation of the infrared-absorption spectrum of calciopetersite.

CALCIOPETERSITE FROM DOMASOV NAD BYSTRICI, NORTHERN MORAVIA, CZECH REPUBLIC, A NEW MINERAL SPECIES OF THE MIXITE GROUP