In order of magnitude, produced minerals were bauxite, gypsum, barite, magnesite, talc and related minerals, manganese ore, fluorspar, and zinc.
en.wikipedia.org Sterile talc powder is inserted into the space, causing it to close up, so fluid can not collect there.
en.wikipedia.org Construction workers who sand drywall joint compound are often exposed to high concentrations of dusts, talc, calcite, mica, gypsum, and in some cases, respirable silica.
en.wikipedia.org Other common minerals include quartz, orthoclase, talc, carbonate minerals and amphibole (actinolite).
en.wikipedia.org It may be composed of talc (in which case it is also called talcum powder) or corn starch.
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