Alunite

noun

noun ·Rare ·Advanced level

Definitions

Noun

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

Synonyms

alum stone calafatite

Etymology

From its earlier name aluminilite, given in 1824.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.