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Silvialite, a new sulfate-dominant member of the scapolite group with an Al-Si composition near the 14/m–P42/n phase transition

Published online by Cambridge University Press:  05 July 2018

D. K. Teertstra ,
M. Schindler ,
B. L. Sherriff  and
F. C. Hawthorne
D. K. Teertstra
Affiliation:
Departmenl of Geological Sciences, University of Manitoba, Winnipeg, Maniloba, Canada R3T 2N2
M. Schindler
Affiliation:
Departmenl of Geological Sciences, University of Manitoba, Winnipeg, Maniloba, Canada R3T 2N2
B. L. Sherriff
Affiliation:
Departmenl of Geological Sciences, University of Manitoba, Winnipeg, Maniloba, Canada R3T 2N2
F. C. Hawthorne
Affiliation:
Departmenl of Geological Sciences, University of Manitoba, Winnipeg, Maniloba, Canada R3T 2N2
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Abstract

Silvialite, ideally Ca4Al6Si6O24SO4, is tetragonal, I4/m, Z = 2, with a = 12.160(3), c = 7.560(1) Å, V = 1117.9(8) Å3, c:a = 0.6217:1, ω = 1.583, ε = 1.558 (uniaxial negative), Dm = 2.75 g/cm3, Dcalc = 2.769 g/cm3 and H (Mohs) = 5.5. It is transparent and slightly yellow, has a good {100} cleavage, chonchoidal fracture, white streak and a vitreous lustre. It occurs in upper-mantle garnet-granulite xenoliths hosted by olivine nephelinite, from McBride Province, North Queensland, Australia. The empirical formula, derived from electron-microprobe analysis, is (Na1.06Ca2.86)(Al4.87Si7.13)O24 [(SO4)0.57(CO3)0.41]. Crystal-structure refinement shows disordered carbonate and sulfate groups along the fourfold axis. Silvialite is a primary cumulate phase precipitated from alkali basalt at 900–1000°C and 8–12 kbar under high fSO2 and fO2. The name silvialite, currently used in literature to describe the sulfate analogue of meionite, was suggested by Brauns (1914).

Keywords

scapolitemeionitesilvialitenew mineralsulfateX-ray dataelectron-microprobe dataQueenslandAustralia
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 3 , June 1999 , pp. 321 - 329
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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