A NEW OCCURRENCE OF LAROSITE FROM THE TINNSJÅ Cu–Ag DEPOSIT, T
- journal_title：The Canadian Mineralogist
- Contributor：Nigel J. Cook ; Cristiana L. Ciobanu ; Øyvind S. Pedersen ; Thor H. Langerud ; Ove A. Karlsen
- Publisher：Mineralogical Association of Canada
- Date：2010-
- Format：text/html
- Language：en
- Identifier：10.3749/canmin.48.6.1569
- journal_abbrev：Can Mineral
- issn：0008-4476
- volume：48
- issue：6
- firstpage：1569
- section：Articles
摘要
A second occurrence of the Cu–Pb–Bi sulfosalt larosite, ideally (Cu,Ag)21PbBiS13, is described from Cu–Ag vein mineralization associated with an amphibolite dyke at Tinnsjå, southern Norway. The host assemblage consists of bornite – chalcocite – magnetite – wittichenite (± chalcopyrite, digenite, stromeyerite) and closely resembles that from the type locality Larosite crystals present an acicular morphology (<100 μm in length, <10 μm in width). An electron-microprobe analysis gives the mean empirical formula Cu20.47Ag3.68Fe0.22Pb1.01Bi1.06S15.00 calculated on the basis of 15 S atoms.