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GEOREF RECORD

Wyllieite and rosemaryite in the pegmatite of Buranga, Rwanda

Andre-Mathieu Fransolet
Wyllieite et rosemaryite dans la pegmatite de Buranga, Rwanda
European Journal of Mineralogy (June 1995) 7 (3): 567-575

Abstract

These two phosphates are noted for the first time from the Buranga pegmatite, having been identified in both cases by EPMA, wet chemical analysis and XRD. The wyllieite has a 11.967, b 12.462, c 6.409 Aa, beta 114 degrees 38'; alpha 1.685, beta 1.688, Gamma 1.692, 2V<F128MV>g<F255D> 90 degrees ; alpha colourless, beta = Gamma bluish green. It occurs as bottle-green globular grains within trolleite masses, in close association with scorzalite; its Fe/(Fe + Mn) is 0.41-0.47. The rosemaryite has a 11.977, b 12.388, c 6.320 Aa, beta 114 degrees 27'; alpha 1.723, beta 1.742, Gamma 1.758, 2V<F128MV>a<F255D> 80 degrees ; alpha = beta weak brownish yellow, Gamma weak greenish yellow. It also occurs within the trolleite masses and at the contact of allaudite-Na<P6M><$B0><P255D> with montebrasite; its Fe/(Fe + Mn) value is 0.44-0.46 (or 0.52 when with montebrasite). It is suggested that in the trolleite association rosemaryite is derived from wyllieite by oxidation.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 3
Title: Wyllieite et rosemaryite dans la pegmatite de Buranga, Rwanda
Translated Title: Wyllieite and rosemaryite in the pegmatite of Buranga, Rwanda
Affiliation: Universite de Liege, Laboratoire de Mineralogie, Liege, Belgium
Pages: 567-575
Published: 199506
Text Language: French
Summary Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 21
Accession Number: 1995-041701
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 4 tables
S02°49'60" - S01°04'60", E28°49'60" - E30°49'60"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199515
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