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GEOREF RECORD

New occurrences of willemite-franklinite assemblages in Bergslagen, central Sweden

Dan Holtstam
New occurrences of willemite-franklinite assemblages in Bergslagen, central Sweden
European Journal of Mineralogy (June 2002) 14 (3): 621-626

Abstract

Two new occurrences of willemite coexisting with franklinite are described from the Bergslagen region. At the Garpenberg Norra Pb-Zn mine (Hedemora, Dalarna) willemite and franklinite occur in silicate skarn rocks in association with clino-amphibole, phlogopite, quartz, galena, sphalerite, fluorite and barite. At the Hasselhojden metacarbonate quarry (Hallefors, Orebro) the two minerals appear with mainly sphalerite in talc-bearing dolomite marble. Based on electron-microprobe (EMP) analyses, willemite from Garpenberg Norra contains 0.4-2.1 MnO, 0.2-1.5 MgO and 0.1-1.2 Fe (sub 2) O (sub 3) , whereas at Hasselhojden the mineral has 0.4 Fe (sub 2) O (sub 3) as the main impurity (all in wt.%). Mossbauer spectroscopy and EMP data show that Fe is dominantly trivalent and to some extent substitutes for Si in these willemite samples. Franklinite from Hasselhojden contains up to 7.6 wt.% V (sub 2) O (sub 5) , incorporated according to the substitution 2 (Zn, Fe) (super 2+) +V (super 5+) = 3 Fe (super 3+) .


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 3
Title: New occurrences of willemite-franklinite assemblages in Bergslagen, central Sweden
Author(s): Holtstam, Dan
Affiliation: Swedish Museum of Natural History, Department of Mineralogy, Stockholm, Sweden
Pages: 621-626
Published: 200206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 23
Accession Number: 2002-047664
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N60°19'60" - N60°19'60", E16°13'60" - E16°13'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200216
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