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I'd like to see more references cited in the first couple of sections. For me personally, I'd like to see citations for the assertions that cenospheres are "inert" and "innoxious". Shorty0927 (talk) 23:55, 6 July 2011 (UTC)
I do not see a need for that. Since cenospheres mainly consist of silica and alumina, at least inertness is a material property like them being hard and not watersoluble. Although, I agree, innoxiousness will largely depend on size of the cenospheres. — Preceding unsigned comment added by 193.158.42.243 (talk) 13:32, 17 July 2015 (UTC)
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micrographs and internal diagrams https://www.google.com/search?q=cenosphere&source=lnms&tbm=isch — Omegatron (talk) 12:46, 20 July 2020 (UTC)