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alumstone

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al⋅u⋅nite

[al-yuh-nahyt]
–noun
a mineral, a hydrous sulfate of potassium and aluminum, KAl3(SO4)2(OH)6, commonly occurring in fine-grained masses.
Also called al⋅um⋅stone [al-uhm-stohn] .


Origin:
1865–70; < F alun (< L alūmen alum 1 ) + -ite 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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