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An approach to the chemistry of pyroxenes formed during the firing of Ca-rich silicate ceramics

Published online by Cambridge University Press:  09 July 2018

M. Dondi ,
G. Ercolani ,
B. Fabbri  and
M. Marsigli
M. Dondi
Affiliation:
CNR-IRTEC, via Granarolo 64, 48018 Faenza, Italy
G. Ercolani
Affiliation:
CNR-IRTEC, via Granarolo 64, 48018 Faenza, Italy
B. Fabbri
Affiliation:
CNR-IRTEC, via Granarolo 64, 48018 Faenza, Italy
M. Marsigli
Affiliation:
CNR-IRTEC, via Granarolo 64, 48018 Faenza, Italy
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Abstract

Carbonate-bearing ceramic bodies are frequently used in the manufacture of bricks, roofing tiles, wall and floor tiles, pottery and tableware. During the firing of these bodies, clinopyroxene is usually formed in very small crystals, 1-5 µm in diameter or less. In the literature this phase is generally referred to as diopside, but no quantitative data are available. In order to chemically characterize these ‘ceramic’ pyroxenes, nine industrial products were analysed by XRF and XRD (bulk sample) and SEM-EDS (fracture surface). Quantitative ZAF analyses of pyroxene crystals showed a certain chemical variability: SiO2 35-50%, Al2O3 9-20%, Fe2O3 1-15%, MgO 3-14%, and CaO 16-25%. Sodium, K and Ti are always <1%, while ferrous iron is always <0.2% in the bulk sample. Overall, ‘ceramic’ clinopyroxenes present wide chemical analogies with ‘fassaite’, e.g. the abundance of aluminium and ferric iron, and the excess ofwollastonite molecules with respect to the diopside-hedenbergite series.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 3 , September 1998 , pp. 443 - 452
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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