Websterite n. : A hydrous sulphate of alumina occurring in white reniform masses.

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Taxonomy
Aluminite, mineral, free encyclopedia, clay, monoclinic, Mohs hardness, specific gravity, pyrite, marcasite, Germany, mineraloid, websterite, sulfate mineral, search, hydrous, formula, H2O, exhibits.

Defination from the web:
Websterite) Jump to: navigation, search. Aluminite is a hydrous aluminium sulfate mineral with formula: Al2SO4(OH)4·7(H2O) ... It is also known as alley stone and websterite (named after English geologist Thomas Webster) ...