Original paper

La rabejacite, Ca(UO2)4(SO4)2(OH)6 6H2O, nouveau sulfate d'uranyle et de calcium des gites du Lodévois, Hérault, France

Deliens, Michel; Piret, Paul

European Journal of Mineralogy Volume 5 Number 5 (1993), p. 873 - 878

10 references

published: Jan 1, 1992
manuscript accepted: Apr 19, 1993
manuscript received: Feb 2, 1993

DOI: 10.1127/ejm/5/5/0873

BibTeX file

ArtNo. ESP147050505016, Price: 29.00 €

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Abstract

Abstract Rabejacite occurs as flattened tablets (up to 0.1 mm), acicular crystals or rounded nodules (up to 0.3 mm). Bright to amber yellow and transparent to translucent with a vitreous luster. Light yellow fluorescence under short-wave and long-wave UV lights. Optically 2V (-) with αcaic. = 1.617, ß = 1.710, γ = 1.758, 2V (meas.) = 68°. Optical orientation, X = c, Y and Z in the plane of the tablets. System orthorhombic, a = 8.73(1), b = 17.09(2), c = 15.72(2) Å, Z = 4, D(calc) = 4.31 g/cm3, D(meas.) > 4.10 g/cm3. The strongest lines in the X-ray powder pattern are (d(Å),I,M/) 7.90 (100) 002, 3.49 (80) 222 & 230, 3.38 (70) 231, 3.98 (40) 123, 4.17 (30) 201. The average of20 electron-microprobe analyses gave: CaO 2.78%, UO3 76.62%, SO3 10.43%, H2O (by chromatography) 10.18%. Empirical formula Ca0.76 (UO2)4.i5(SO4)2.o2(OH)5.78 • 5.86 H2O or ideally Ca(UO2)4(SO4)2(OH)6 • 6H2O. Rabejacite was found in two deposits of the Permian basin of Lodève: in the red Saxonian pelites from Rabejac (7 km S-SE from Lodève) and in the gray Autunian from Mas d'Alary Village (3 km S-SE from Lodève). The mineral appears in the alteration zone and forms mixed crusts together with gypsum. The name is for the locality of the first discovery

Keywords

new mineralrabejaciteuranyl sulphateLodèveFrance