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Cupromakovickyite, Cu (sub 8) Pb (sub 4) Ag (sub 2) Bi (sub 18) S (sub 36) ; a new mineral species of the pavonite homologous series

Dan Topa and Werner H. Paar
Cupromakovickyite, Cu (sub 8) Pb (sub 4) Ag (sub 2) Bi (sub 18) S (sub 36) ; a new mineral species of the pavonite homologous series
The Canadian Mineralogist (April 2008) 46 (2): 503-514

Abstract

Cupromakovickyite, ideally Cu (sub 8) Pb (sub 4) Ag (sub 2) Bi (sub 18) S (sub 36) , is a new mineral species that occurs at the skarn deposit of Baita Bihor, Romania, and at the scheelite deposit Felbertal, Salzburg Province, Austria. The associated minerals are makovickyite, bismuthinite derivatives (aikinite-friedrichite range), hodrusite, kupcikite, paderaite, emplectite, wittichenite and tetradymite (Baita Bihor), and makovickyite, bismuthinite derivatives (aikinite-krupkaite range), hodrusite, kupcikite, wittichenite and native bismuth (Felbertal). The opaque mineral is grey, has a metallic luster and is brittle without any discernable cleavage. The mean micro-indentation hardness is 295 kg/mm (super 2) , corresponding to a Mohs hardness of 4. In reflected light, it is grayish white; the bireflectance is weak, and the anisotropy is moderate in air and strong in oil. Internal reflections are absent. The reflectance data (air) are: 42.1, 48.5 at 470 nm, 41.0, 46.9 at 546 nm, 40.2, 45.8 at 589 nm and 39.6, 45.0% at 650 nm. The average results of five electron-microprobe analyses are: Cu 7.66(1), Ag 4.01(3), Pb 9.45(3), Bi 60.02(9), Se 0.30(1), Te 0.76(3), S 17.55(2), total 99.75(7) wt.%, corresponding to Cu (sub 7.79) Ag (sub 2.4) Pb (sub 2.95) Bi (sub 18.55) (Se (sub 0.24) Te (sub 0.39) S (sub 35.37) ) (sub Sigma 36) , calculated on the basis of Sigma (S + Se + Te) = 36 atoms per formula unit. The simplified formula, Cu (sub 8) Pb (sub 4) Ag (sub 2) Bi (sub 18) S (sub 36) , is in accordance with the empirical formula and that deduced from the crystal-structure analysis. The density, 6.78 g/cm (super 3) , was calculated using the ideal (structural) formula and Z = 1. Cupromakovickyite has a monoclinic cell with a 13.405(8), b 4.016(3), c 29.949(19) Aa, beta 99.989(16) degrees , V 1587.8(17) Aa (super 3) , space group C2/m, and Z = 1. The strongest lines in the calculated powder-diffraction pattern [d in Aa(I)(hkl)] are: 3.478(100)(114), 2.842(94)(312), 3.646(57)(206), 3.486(41)(208), 3.345(33)(402), 2.964(33)(310), 2.282(31)(1110). Its c dimension is double the length of the c dimension of makovickyite, the N = 4 member of the pavonite homologous series. Cupromakovickyite is closely structurally related to makovickyite. The name of the new mineral expresses this relationship. Both the mineral and its name were approved by the Commission on New Minerals and Mineral Names (IMA 2002-58).


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 46
Serial Issue: 2
Title: Cupromakovickyite, Cu (sub 8) Pb (sub 4) Ag (sub 2) Bi (sub 18) S (sub 36) ; a new mineral species of the pavonite homologous series
Affiliation: University of Salzburg, Department of Materials Research & Physics, Salzburg, Austria
Pages: 503-514
Published: 200804
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 13
Accession Number: 2008-102392
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N46°55'00" - N48°02'60", E12°04'00" - E14°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200835
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