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Ranunculite, AlH(UO2)(PO4)(OH)3 · 4H2O, a new mineral 1

Published online by Cambridge University Press:  05 July 2018

Michel Dellens  and
Paul Piret
Michel Dellens
Affiliation:
Département de Géologie et de Minéralogie, Musée royal de l'Afrique centrale, B 1980 Tervuren, Belgium
Paul Piret
Affiliation:
Laboratoire de Chimie physique et de Cristallographie de l'Université, B 1348 Louvain-la-Neuve, Belgium
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Summary

Ranunculite occurs as gold-yellow nodules. Mean diameter = 0.3 mm. Optically biaxial negative, 2V (calc.) = 56°. γ =1.670, β = 1.664, and α = 1.643. Monoclinic, pseudo-orthorhombic with a = 11.1 Å, b = 17.7 Å, c = 18.0 Å, and β ⋍ 90°. Z = 14. Measured density = 3.4 g/cm3. Calculated density = 3.39 g/cm3. The strongest lines of the X-ray powder pattern are (d, hkl, I): 9.00, 002–020 (100), 3.133, 330 (80), 470, 202–220 (50), 2.978, 006–060 (40), and 1.850, 600 (40). Chemical analysis by electron microprobe: Al2O3 9.9%, UO3 54.5%, P2O5 13.2%, H2O by thermogravimetry 20.3%. Formula: AlH(UO2)(PO4)(OH)3 · 4H2O. Ranunculite occurs at Kobokobo, Kivu, Zaïre, in pegmatitic rocks. The name after the colour (ranunculus = buttercup).

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 327 , September 1979 , pp. 321 - 323
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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References

Deliens, (M.) and Piret, (P.), 1977. Les phosphates d'uranyle et d'aluminium de Kobokobo. I. Données préliminaires. Bull. Soc. Belg. Géol. 86, 183-90.Google Scholar
Deliens, (M.) and Piret, (P.) 1979a. Les phosphates d'uranyle et d'aluminium de Kobokobo. II. La phuralumite, Al2(UO2)3(PO4)2(OH)61OH2O et l'upalite A1 (UO2)a(PO4)2(OH)3, nouveaux mineraux. Bull. Soc. ft. Mindral. Cristallogr., in press.CrossRefGoogle Scholar
Deliens, (M.) and Piret, (P.) 1979b. Les phosphates d'uranyle et d'aluminium de Kobokobo. IV. La threadgoldite, AlH(UO2)2(PO4)2(OH)3, nouveau minéral, to be published.CrossRefGoogle Scholar