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Cesanite, Ca2Na3[(OH)(SO4)3] , a sulphate isotypic to apatite, from the Cesano geothermal field (Latium, Italy)

Published online by Cambridge University Press:  05 July 2018

G. Cavarretta ,
A. Mottana  and
F. Tecce
G. Cavarretta
Affiliation:
Centro Di Studio per la Geologia dell'Italia Centrale del C.N.R., c/o Istituto di Geologia e Paleontologia, Città Universitaria, 00185 Roma, Italy
A. Mottana
Affiliation:
Cattedra di Mineralogia, Istituto di Mineralogia e Petrografia, Città Universitaria, 00185 Roma, Italy
F. Tecce
Affiliation:
Progetto Finalizzato ‘Energetica’ del C.N.R., c/o Istituto di Geologia e Paleontologia, Città Universitaria, 00185 Roma, Italy
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Abstract

Cesanite occurs both as a solid vein (1 cm thick) and as a cavity-filling of an explosive breccia in core samples of the Cesano 1 geothermal well (Cesano area, Latium, Italy).

Cesanite is coloudess, medium to coarse grained, soft (H = 2 to 3) and light (ρmeas 2.786±0.002 g cm−3). It is uniaxial negative, ε = 1.564, ω = 1.570, with space group P63/m and cell parameters a = 9.442 (4), c = 6.903 (3) Å, for c/a = 0.730. Identifying spacings are 8.161, 2.822, 2.727,1.844 Å, in X-ray powder patterns strikingly similar to those of apatite. The chemical formula (microprobe analyses on two grains) is Ca1.53Sr0.03Na3.42K0.02[(Cl0.06F0.06OH0.44)(S2.99O12)]·0.44H2O, while the theoretical formula, derived from considerations on structural identity with apatite, is Ca2Na3[(OH)(SO4)3]. Cesanite is the end member of the apatite-wilkeite ellestadite series where [PO4]3− is entirely substituted by [SO4]2−, the charge balance being made up by Na+ substituting for Ca2+.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 335 , September 1981 , pp. 269 - 273
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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