Abstract
Summary
Green calcium sulphosilicate layers were
formed in lime-larnite-calcite wall coating in a
lime kiln at Rivervale, Western Australia. The
compound formed in the kiln flame area by the
combination of siliceous lime sand feed with
sulphur trioxide from the sulphurous oil
fuel.
The calcium sulphosilicate is orthorhombic
with a 10·183,
b 15·408,
c 6·825 Å, space group
Pcmn. Crystals are
[100] tablets or prisms elongated along
c, D 2·95, hardness 5,
streak pale green, decomposed by organic acids.
Optical properties α
1·632 = [001] blue, β
1·638 = [100] yellow-green
γ 1·640 yellow-green,
2Vα = 60°, dispersion
r >
v, X-ray powder lines:
2·855 (10) 032,202; 2·838 (7) 330,321; 3·35 (6)
012; 2·622 (6) 331; 2·571 (6) 060; 3·20 (5) 231;
1·962 (5); 1·899 (5); 1·896 (5); 1·372
(5).
Chemical analysis by P. Hewson gave:
SiO2 21·50,
Al2O3
1·83,
Fe2O2
0·50, CO2 0·49,
P2O5
0·23, CaO 57·19, MgO 0·35,
Na2O 0·22,
K2O 0·22, SrO 0·15,
Li2O 0·06,
SO3 16·71,
H2O+
0·28,
H2O−
0·10, others 0·04, total 99·87. On a water-free
basis the unit cell contains
Ca19.66
Mg0.17
Na0.14
K0.08
Sr0.03
Li0.08
approximately
4[Ca5(SiO4)2SO4]
and isostructural with silicocarnotite,
4[Ca5(PO4)2SiO4].
Type material is preserved at the Government
Chemical Laboratories, Perth, Western
Australia.
Subject
Geochemistry and Petrology
Cited by
21 articles.
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