Recent experimental work has not tended to support the hypothesis that chalcedony contains interstitial opal. Instead, the results seem to show that chalcedony is essentially microcrystalline quartz with submicroscopic pores. The “quartz-with-holes” theory, however …
CITATION STYLE
Pelto, C. R. (1956). A study of chalcedony. American Journal of Science, 254(1), 32–50. https://doi.org/10.2475/ajs.254.1.32
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