Afwillite | Article about afwillite by The Free Dictionary
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Ca3Si2O4(OH)6 A colorless mineral consisting of a hydrous calcium silicate and occurring in monoclinic crystals; specific gravity is 2.6.
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Then comes the main event: the "slide show" of microphotographs by Jochen Tscheortner (with a few interspersed SEM photographs) of 162 species, afwillite