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The Collaborative International Dictionary
Websterite

Websterite \Web"ster*ite\, n. [So named after Webster, the geologist.] (Min.) A hydrous sulphate of alumina occurring in white reniform masses.

Wiktionary
websterite

n. A hydrous aluminium sulfate mineral with formula Al2SO4(OH)4ยท7(H2O).

Wikipedia
Websterite

For the hydrous aluminium sulfate mineral "websterite", see aluminite. Websterite is ultramafic igneous rock that consists of roughly equal proportions of orthopyroxene and clinopyroxene. It is a type of pyroxenite.

Websterite is named after the town Webster in North Carolina.