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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


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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