Skip to Main Content
GEOREF RECORD

The anhydrous amphibole ungarettiite from the Woods Mine, New South Wales, Australia

Yosuke Kawachi, Douglas S. Coombs, Bernard E. Leake and Richard W. Hinton
The anhydrous amphibole ungarettiite from the Woods Mine, New South Wales, Australia
European Journal of Mineralogy (April 2002) 14 (2): 375-377

Abstract

At the Woods mine, 30 km NNE of Tamworth, NSW, ungarettiite occurs in Mn-rich pods enclosed in chert and mudstone. EPMA results show it to be very close to end-member composition, NaNa (sub 2) Mn (super 2+) (sub 2) Mn (super 3+) (sub 3) Si (sub 8) O (sub 22) O (sub 2) . The first direct determination of H (sub 2) O (< 60 ppm) in this anhydrous amphibole, together with F (53 ppm) and Cl (5 ppm), gives a maximum (OH + F + Cl) of approximately 0.01 pfu. Li is approximately 4 ppm and Fe varies from below detection to approximately 0.35 atoms pfu. Fe is strongly partitioned into any associated manganian aegirine. The Mn (super 3+) gives a large cation charge, requiring a balancing anion charge necessitating the occurrence of O (super 2-) instead of the more usual amphibole (OH + F + Cl) (super -) at the O3 site, giving O (sub 24) in the structural formula.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 2
Title: The anhydrous amphibole ungarettiite from the Woods Mine, New South Wales, Australia
Affiliation: University of Otago, Geology Department, Dunedin, New Zealand
Pages: 375-377
Published: 200204
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 10
Accession Number: 2002-027809
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S37°30'00" - S28°15'00", E141°00'00" - E153°30'00"
Secondary Affiliation: Cardiff University, GBR, United KingdomUniversity of Edinburgh, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200210
Close Modal

or Create an Account

Close Modal
Close Modal