Differential Thermal and X-Ray Analysis of Opal

Abstract

PUBLISHED differential thermal analysis curves of opal show a marked rounded endotherm with the peak near 130° C, although one example shows a very small peak at this temperature1. Curves we have obtained from the differential thermal analysis of some thirty naturally occurring opaline silicas can be broadly classified into three groups with: (1) a very… (More)
DOI: 10.1038/1981191a0

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