Afwillite
From Wikipedia, the free encyclopedia
Afwillite is a calcium hydroxide nesosilicate mineral with formula Ca3Si2O4(OH)6. It occurs as glassy, colorless to white prismatic monoclinic crystals. Its Mohs scale rating is 4.5. It occurs as an alteration mineral in contact metamorphism of limestone.
It was first described in 1925 for an occurrence in the Dutoitspan Mine, Kimberley, South Africa and was named for Alpheus Fuller Williams (1874-1953), a past official of the De Beers diamond company.
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