Bulletin Mineralogie Petrologie

Sejkora Jiří, Škácha Pavel, Dvořák Zdeněk, Muzikant Pavel

Ročník 23, číslo 1 (2015), strana 1-18

slavkovite, olivenite, strashimirite, new mineral phases, powder X-ray diffraction data, unit-cell parameters, chemical composition, Krupka ore district, Czech Republic

A unique supergene mineral association was found at abandoned Gallery No. 3 Preisselberg, the Krupka ore district, Krušné hory Mountains, Czech Republic. Slavkovite forms there light pale blue to blue-green rosettes up to 1 mm across composed by lath-like crystals; it is translucent (in aggregates) to transparent (in crystals), very brittle, and has a vitreous luster and perfect cleavage. It is triclinic, space group P-1, the unit-cell parameters refined from X-ray powder diffraction data are: a 6.414(2), b 14.370(3), c 16.527(4) Å, α 102.81(2), β 101.12(2), γ 97.94^o and V 1431.0(8) ų; its chemical analyses correspond to the empirical formula (Cu_12.92Zn_0.05Al_0.02)_Σ12.99[(AsO₄)_6.01(PO₄)_0.01]_Σ6.02(AsO₃OH)_3.98·23H₂O on the basis As+P=10 apfu. Olivenite was found as relatively abundant dark olive green hemispherical to spherical aggregates up to several mm in size. It is orthorhombic, space group Pnnm, the unit-cell parameters refined from X-ray powder diffraction data are: a 8.6300(8), b 8.2405(8), c 5.8384(2) Å and V 422.31(5) ų; its chemical analyses correspond to the empirical formula (Cu_2.01Zn_0.01Fe_0.01)_Σ2.03[(AsO₄)_0.99(PO₄)_0.01]_Σ1.00(OH)_1.06 on the basis As+P = 1 apfu. Abundant strashimirite occurs there as greenish to white coatings on the area to several cm², its light green crystalline aggregates up to 0.5 mm in size consisting of acicular crystals are more rare. Strashimirite is probably monoclinic, space group P2, the unit-cell parameters refined from X-ray powder diffraction data are: a 9.569(6), b 18.59(1), c 9.032(6) Å, β 97.21(6)^o and V 1594(1) ų; its chemical analyses correspond to the empirical formula (Cu_7.89Al_0.07Zn_0.05Ca_0.03)_Σ8.04[(AsO₄)_3.74(SO₄)_0.24(PO₄)_0.03]_Σ4.00(OH)_4.41·5H₂O on the basis As+P+S = 4 apfu. Brochantite forms there abundant dark green fine crystalline coatings on the area up to several cm² in size and rarely also dark green tiny (up to 0.5 mm) prismatic crystals. It is monoclinic, space group P2₁/a, the unit-cell parameters refined from X-ray powder diffraction data are: a 13.133(1), b 9.855(1), c 6.016(1) Å, β 103.25(1)^o and V 757.8(1) ų; its chemical analyses correspond to the empirical formula (Cu_3.91Al_0.02)_Σ3.93[(SO₄)_0.97(AsO₄)_0.03]_Σ1.00(OH)_5.85 on the basis S+As+P = 1 apfu. Devilline was found as relatively abundant whitish fine crystalline coatings on the area up 1 x 1 cm in size; light bluish green aggregates up to 0.5 cm across or rarely also transparent tabular crystals up to 0.2 mm across. Devilline is monoclinic, space group P2₁/c, the unit-cell parameters refined from X-ray powder diffraction data are: a 20.86(1), b 6.195(3), c 21.96(1) Å, β 102.92(1)^o and V 2767(3) ų; its chemical analyses correspond to the empirical formula Ca_1.05(Cu_4.11Al_0.02)_Σ4.13(SO₄)_2.00(OH)_6.39·3H₂O on the basis S = 2 apfu. An unnamed Cu-Ca arsenate occurs there as lavendulan-like blue crystalline coatings covering area up to 5 x 5 mm in size or hemispherical aggregates up to 0.5 mm across; its aggregates are composed from very thin (only 1 - 4 μm) tabular crystals up to 80 μm in size. Its X-ray powder data (strongest line 12.51 Å) does not correspond to any known mineral phases. Chemical composition of this mineral phase is possible to be expressed on the basis As+P+S = 4 apfu by empirical formulae Na_0.03Ca_1.03(Cu_4.99Al_0.03Zn_0.01)_Σ5.03 [(AsO₄)_3.73(SO₄)_0.25(PO₄)_0.02]_Σ4.00Cl_0.43·nH₂O (thin tabular aggregates) or (Na_0.03K_0.02)_Σ0.16Ca_1.17(Cu_4.69Al_0.03Zn_0.01)_Σ4.73[(AsO₄)_3.73(SO₄)_0.25(PO₄)_0.02]_Σ4.00 Cl_0.59·nH₂O (tabular aggregates). Further an unnamed Cu arsenate forms there light pale bluish green crystalline aggregates up 1 - 2 mm in size composed by tabular crystals up to 250 μm across in association with slavkovite. It is transparent to translucent, has a vitreous luster and perfect cleavage. Its X-ray powder data (strongest line 9.807 Å) does not correspond to any known mineral phases. This mineral phase is considerably unstable under electron beam of EPMA, the cation/anion ratio determined drom WDS is in the range of 1.16 - 1.36. The origin of described mineral association is connected with (sub)recent weathering of primary tennantite in conditions of abandoned mine adit. Origin of Cu-arsenates is possible to express by following sequence: strashimirite → Cu-Ca arsenate → olivenite → slavkovite → Cu-arsenate.

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