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alunite

[al-yuh-nahyt] /ˈæl yəˌnaɪt/
noun
1.
a mineral, a hydrous sulfate of potassium and aluminum, KAl 3 (SO 4) 2 (OH) 6 , commonly occurring in fine-grained masses.
Also called alumstone
[al-uh m-stohn] /ˈæl əmˌstoʊn/ (Show IPA)
.
Origin of alunite
1865-1870
1865-70; < French alun (< Latin alūmen alum1) + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for alunite

alunite

/ˈæljʊˌnaɪt/
noun
1.
a white, grey, or reddish mineral consisting of hydrated aluminium sulphate. It occurs in volcanic igneous rocks and is a source of potassium and aluminium compounds. Formula: KAl3(SO4)2(OH)6
Word Origin
C19: from French alun alum (from Latin alūmen) + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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