alunite

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Related to Alumstone: potassium alum

al·u·nite

 (ăl′yə-nīt′)
n.
A gray mineral, chiefly KAl3(SO4)2(OH)6, used in making alum and fertilizer.

[French, from alun, alum, from Latin alūmen.]

alunite

(ˈæljʊˌnaɪt)
n
(Minerals) 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
[C19: from French alun alum (from Latin alūmen) + -ite1]

al•u•nite

(ˈæl yəˌnaɪt)

n.
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 (ˈæl əmˌstoʊn)
[1865–70; < French alun (< Latin alūmen alum1) + -ite1]