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A natural ferrous substituted saléeite from Arcu su Linnarbu, Capoterra, Cagliari, Sardinia

Published online by Cambridge University Press:  05 July 2018

R. Vochten  and
K. Van Springel
R. Vochten
Affiliation:
Laboratorium voor chemische en fysische mineralogie, Departement Scheikunde, Universiteit Antwerpen, Middelheimlaan 1, 2020 Antwerpen, Belgium
K. Van Springel
Affiliation:
Laboratorium voor chemische en fysische mineralogie, Departement Scheikunde, Universiteit Antwerpen, Middelheimlaan 1, 2020 Antwerpen, Belgium
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Abstract

Ferrous substituted saléeite is a new variety of saléeite from Arcu su Linnarbu, Sardinia. It is tetragonal with a = 6.982(2) c = 19.660(2) Å, Z = 2; the ideal formula is (Mg,Fe2+)(UO2)2(PO4)2·4H2O. The strongest lines in the X-ray powder diffraction pattern are: 3.473(100)(114), 4.95(50)(110), 4.91(40)(004), 4.443(40)(112), 2.200(30)(118), 2.193(30)(303) and 2.178(30)(009). The mineral is light-yellow in colour and is dull fluorescent. The measured density is 3.242 g/cm3 and Z = 2. There is a prominent (001) cleavage. Refractive indices are : α = 1.572(2) β = 1.577(2) γ = 1.581(2) and 2V = 48°(2). The pleochroism is very weak and the elongation is positive parallel to Y. The mineral occurs as subparallel crystal aggregates with a quadratic outline.

Keywords

saléeiteferrous substitutionuranyl phosphate groupArcu Su LinnarbuSardinia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 401 , August 1996 , pp. 647 - 651
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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