TY - JOUR

T1 - Coparsite, Cu4O2[(As,V)O4]Cl, a new mineral species from the Tolbachik volcano, Kamchatka Peninsula, Russia

AU - Vergasova, Lidiya P.

AU - Starova, Galina L.

AU - Krivovichev, Sergey V.

AU - Filatov, Stanislav K.

AU - Ananiev, Vladimir V.

PY - 1999/8/1

Y1 - 1999/8/1

N2 - Coparsite, ideally Cu4O2[(As,V)O4]Cl, occurs in the fumarole 'Yadovitaya' (= 'Poisonous') in the North Breach of the great tissure Tolbachik eruption (1975-1976), Kamchatka Peninsula, Russia. It occurs as black or dark grey crystals, tabular on (100), elongate in the [010] direction, with well-developed {100}, {110} and {101} forms. Associated minerals are euchlorine, tolbachite, kamchatkite, ponomarevite, minerals from the klyuchevskite-alumoklyuchevskite solid-solution series, hematite, tenorite and vanadian lammerite. The grains of coparsite are found as small black inclusions in emerald-green euchlorine. The mineral has a metallic luster and a brown streak. Non-fluorescent. It is very brittle and thus does not allow measurements of hardness. Cleavage is perfect on the (100) plane. Coparsite is orthorhombic, space group Pbcm, a 5.440(1), b 11.154(2), c 10.333(2) Å, V 627.0(3) Å3, Z = 4, D(calc) = 4.76(1) g/cm3 (based on the empirical formula). Diagnostic lines of the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 5.31 (30)(010), 4.69(40)(110), 3.70(30)(012), 3.03(60)(310), 2.82(10)(113), 2.62(100)(312), 2.39(40)(022,221), 1.67(20)(324,405). Electron-microprobe analyses yielded: CuO 69.03 (67.68-70.16), Fe2O3 0.17 (0-0.87), As2O5 15.50 (13.13-20.23), V2O5 7.72 (4.06-9.24), SO3 0.57 (0.20-0.99), Cl 8.47 (8.17-8.75), subtotal 101.46, O = Cl2-1.91 (1.84-1.97), total 99.55 (98.09-101.55) wt%. The empirical formula, normalized to O + Cl = 7 apfu, is Cu3.89Fe0.01O1.93 [(As0.60V0.38S0.03)O4]Cl1.07, close to the ideal Cu4O2((As,V)O4)Cl confirmed by crystal-structure analysis. The mineral is named after its chemical composition: cop(per) + ars(enic).

AB - Coparsite, ideally Cu4O2[(As,V)O4]Cl, occurs in the fumarole 'Yadovitaya' (= 'Poisonous') in the North Breach of the great tissure Tolbachik eruption (1975-1976), Kamchatka Peninsula, Russia. It occurs as black or dark grey crystals, tabular on (100), elongate in the [010] direction, with well-developed {100}, {110} and {101} forms. Associated minerals are euchlorine, tolbachite, kamchatkite, ponomarevite, minerals from the klyuchevskite-alumoklyuchevskite solid-solution series, hematite, tenorite and vanadian lammerite. The grains of coparsite are found as small black inclusions in emerald-green euchlorine. The mineral has a metallic luster and a brown streak. Non-fluorescent. It is very brittle and thus does not allow measurements of hardness. Cleavage is perfect on the (100) plane. Coparsite is orthorhombic, space group Pbcm, a 5.440(1), b 11.154(2), c 10.333(2) Å, V 627.0(3) Å3, Z = 4, D(calc) = 4.76(1) g/cm3 (based on the empirical formula). Diagnostic lines of the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 5.31 (30)(010), 4.69(40)(110), 3.70(30)(012), 3.03(60)(310), 2.82(10)(113), 2.62(100)(312), 2.39(40)(022,221), 1.67(20)(324,405). Electron-microprobe analyses yielded: CuO 69.03 (67.68-70.16), Fe2O3 0.17 (0-0.87), As2O5 15.50 (13.13-20.23), V2O5 7.72 (4.06-9.24), SO3 0.57 (0.20-0.99), Cl 8.47 (8.17-8.75), subtotal 101.46, O = Cl2-1.91 (1.84-1.97), total 99.55 (98.09-101.55) wt%. The empirical formula, normalized to O + Cl = 7 apfu, is Cu3.89Fe0.01O1.93 [(As0.60V0.38S0.03)O4]Cl1.07, close to the ideal Cu4O2((As,V)O4)Cl confirmed by crystal-structure analysis. The mineral is named after its chemical composition: cop(per) + ars(enic).

KW - Arsenate-vanadate

KW - Coparsite

KW - Kamchatka Peninsula

KW - New mineral species

KW - Russia

KW - Tolbachik volcano

UR - http://www.scopus.com/inward/record.url?scp=0033374810&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033374810

VL - 37

SP - 911

EP - 914

JO - Canadian Mineralogist

JF - Canadian Mineralogist

SN - 0008-4476

IS - 4

ER -