alunite
(noun)
noun
1. (mineralogy) A gray, water-soluble mineral, potassium aluminium sulphate; the natural source of alum, KAl3(SO4)2(OH)6.
(noun)
1. (mineralogy) A gray, water-soluble mineral, potassium aluminium sulphate; the natural source of alum, KAl3(SO4)2(OH)6.