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@Brendanjones Unfortunately, I have no time to read the whole interview, I could only skim it. She's great in public relations. When things get interesting, she dodges the question and talks about "great stuff". She talks about basalt rocks (which ones), about bottom ash (others use that, too). She talks of calcium silicate that they use but not how it differs from industry (sometimes it comes from slag and that's absolutely not carbon-neutral).
I found this https://en.wikipedia.org/wiki/Cement_chemist_notation