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Title:
Garavellite, FeSbBiS4, from the Caspari mine, North Rhine-Westphalia, Germany: composition, physical properties and determination of the crystal structure
Authors:
Bindi, L.; Menchetti, S.
Affiliation:
AA(Dipartimento di Scienze della Terra, Universitàdegli Studi di Firenze; , Museo di Storia Naturale, Sezione di Mineralogia e Litologia, Università degli Studi di Firenze), AB(Dipartimento di Scienze della Terra, Universitàdegli Studi di Firenze)
Publication:
Mineralogy and Petrology, Volume 85, Issue 3-4, pp. 131-139
Publication Date:
12/2005
Origin:
SPRINGER
Abstract Copyright:
(c) 2005: Springer-Verlag/Wien
DOI:
10.1007/s00710-005-0083-7
Bibliographic Code:
2005MinPe..85..131B

Abstract

Garavellite, FeSbBiS4, was found in a sample of the mineralogical collection of the Natural History Museum of the University of Florence. The sample is from the Cu Fe deposit of Caspari, Saverland, North Rhine-Westphalia, Germany. Garavellite occurs as very rare, elongated prismatic crystals up to 100 µm in length, spatially associated with large berthierite crystals, bismuthinite, chalcopyrite, and siderite. It does not contain inclusions of or intergrowths with other minerals. Macroscopically garavellite is grey in colour and shows a grey-black streak. The Vickers hardness (VHN50) is 206 kg/mm2. In plane-polarized incident light garavellite is grey in colour, with distinct bireflectance. Reflectance percentages for Rmin and Rmax are 33.8, 41.8 (471.1 nm), 33.3, 40.9 (548.3 nm), 32.7, 39.5 (586.6 nm), and 32.4, 38.8 (652.3 nm), respectively.
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