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GEOREF RECORD

Special issue dedicated to the memory of Luciano Ungaretti

Maria Chiara Domeneghetti (prefacer)
Special issue dedicated to the memory of Luciano Ungaretti
European Journal of Mineralogy (April 2003) 15 (2): 15

Index Terms/Descriptors
Abstract

The phase TIPbAs3S6, synthesized in the course of hydrothermal experiments by A. Edenharter (1982), was found as a natural mineral at the well known occurrence of Pb-Tl-Cu-Ag-As-sulphosalt minerals in Lengenbach, Binntal (Switzerland). It occurs in small cavities in Triassic dolomite, together with a large number of other As sulphosalt minerals such as hutchinsonite, hatchite, wallisite, lorandite, and abundant realgar and orpiment. Edenharterite forms euhedral lathlike crystals (less than 1 mm in size), mostly intergrown to aggregates up to 2 - 3 mm. Electron microprobe analysis yielded (mean of 3 analyses): Tl 25.51, Pb 25.08, Sn 0.06, As 27.09, S 23.17, total 100.91 wt %. The simplified formula is close to TIPbAssSo. The mineral is bright brown-black. In thin fragments it is red translucent and has a raspberry-red streak. Microhardness is 98 kg/mm2 (10 g load), corresponding to a Moris hardness of about 2 1/2 - 3, Dcalc = 5.09 g/cm3. Single crystal studies gave an orthorhombic cell with a = 15.465(3), b = 47.507 (8), c = 5.843(2) Aa, V = 4292 Aa3, space group Fdd2 and Z = 16. The strongest lines in the X-ray powder pattern are (dobs, Us, hkl): 3.801 (100)(191) ; 3.389 (22)(1.11.1) ; 2.901 (19)(3.11.1) ; 2.767 (43)(4.12.0) ; 2.732 (41)(511) ; 2.656 (24)(3.13.1) ; 1.7905 (15)(8.10.0). The name is for Dr. Andreas EDENHARTER (University of Goettingen) who first synthesized the phase TIPbAS3S6 while conducting hydrothermal experiments with Tl-sulphosalts.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 2
Title: Special issue dedicated to the memory of Luciano Ungaretti
Author(s): Domeneghetti, Maria Chiaraprefacer
Pages: 241-441
Published: 200304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Accession Number: 2003-032464
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Monographic
Annotation: Individual papers are cited separately
Illustration Description: illus.
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute.
Update Code: 200311
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