Type calcium hydroxide
Essential mineral(s) {{{Essential mineral(s)}}}
Accessory mineral(s) {{{Accessory mineral(s)}}}

Afwillite is a calcium hydroxide neosilicate mineral. It often occurs with a glassy appearance to being a thin whitish color and forms in crystals. It often occurs as an alteration of limestone.

It was first described in 1925 and is named after Alpheus Fuller Williams.

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