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GEOREF RECORD

Crystal chemistry of the tsumcorite-group minerals; new data on ferrilotharmeyerite, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrelllite

Werner Krause, Klaus Belendorff, Heinz-Juergen Bernhardt, Catherine McCammon, Herta Effenberger and Werner Mikenda
Crystal chemistry of the tsumcorite-group minerals; new data on ferrilotharmeyerite, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrelllite
European Journal of Mineralogy (April 1998) 10 (2): 179-206

Abstract

The general formula for the tsumcorite-group minerals is Me(1)Me(2) (sub 2) (XO (sub 4) ) (sub 2) (OH,H (sub 2) O) (sub 2) , where Me(1) = Pb, Ca, Na and partly Bi; Me(2) = Fe, Mn, Cu, Zn, Co, Ni and partly Al; X = P, As, V, S. The optical properties, morphology, chemical composition, IR and Moessbauer spectra and crystal structure of ferrilotharmeyerite, tsumcorite, sulphatian thometzekite, mounanaite, hellmutwinklerite, gartrellite and zincian gartrellite were investigated. The crystal symmetry is either: 1) triclinic in the case of an ordered occupation of two Me(2) sites, 2) triclinic due to ordering of the hydrogen bonds in the case of species with 2H (sub 2) O pfu or 3) monoclinic in the other cases. Moessbauer measurements confirmed the Fe in ferrilotharmeyerite, tsumcorite, gartrellite and zincian gartrellite to be completely trivalent. EPMA showed that at least partial solid solution is common for the Me(2) and less frequent for the X and Me(1) site. In addition to homovalent substitutions, there are three heterovalent exchange mechanisms with coupled substitutions. Ferrilotharmeyerite, tsumcorite, thometzekite and mounanaite are monoclinic, space group C2/m; there is no evidence for protonated arsenite groups. Gartrellite, zincian gartrellite, phosphogartrellite, helmutwinklerite and probably (sulphate-free) thometzekite are triclinic, space group P<$E 1 back 40 up 40 ->. Gartrellite is redefined as PbCuFe (super 3+) (AsO (sub 4) ) (sub 2) (OH)(H (sub 2) O), but it often also contains Zn (up to 12.6 wt.% ZnO).


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 10
Serial Issue: 2
Title: Crystal chemistry of the tsumcorite-group minerals; new data on ferrilotharmeyerite, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefinition of gartrelllite
Affiliation: Henriette-Lott-Weg 8, Hurth, Federal Republic of Germany
Pages: 179-206
Published: 199804
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 89
Accession Number: 1998-032472
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 9 tables
Secondary Affiliation: Albert-Einstein-Strasse, Munster, DEU, Federal Republic of GermanyRuhr-Universitaet Bochum, Bochum, DEU, Federal Republic of GermanyUniversitaet Bayreuth, Bayreuth, DEU, Federal Republic of GermanyUniversitaet Wien, Vienna, AUT, Austria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199813
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