A term applied to white formless pasty or powdery masses found in caves, sometimes wet with cheese-like consistency, sometimes dry masses of sticky powder; composed of several carbonate minerals. The mechanism by which the organisms break down the calcite and redeposit it as moonmilk has not been determined. A bacterial origin seems probable for some moonmilk.

From: http://www.nps.gov/cave/glossary.htm#I

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