The synthesis and stability of tilleyite, Ca 5 Si 2 O 7 (CO 3 ) 2

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ID: 297085
1959
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Abstract
At 5,000 lbs./in. ^2^ of CO ~2~ , tilleyite is stable between 930 and 970 degrees C. and at 3,000 lbs./in. ^2^ of CO ~2~ , between 870 and 930 degrees C. The conditions of its stability are defined, on a P ~CO2~ -T diagram, by a narrow band lying between the more carbonated calcite + wollastonite assemblage and the less carbonated spurrite. Under the conditions of the experiments it was found that traces of alumina and fluoride were necessary to effect the synthesis of tilleyite. A consideration of natural mineral assemblages currently supports the evidence that the presence of these 2 components is very effective in promoting the formation of tilleyite. With sufficient alumina, the formation of gehlenite can be detected in apparent equilibrium with calcite + wollastonite, tilleyite, or spurrite.
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Authors R. I. Harker
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.9.656
URL
https://ajs.scholasticahq.com/article/58780.pdf
Keywords Keywords not found

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