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A triclinic mineral, Al2 (H2 O)12 (SO4 )3.5(H2 O) ; in fibrous masses or crusts; white, tinged yellow to reddish, with sharp acid taste; in acid environments filling crevices in coals, slates, gossans, and fumaroles. Syn: feather alum; hair salt.
Source: Dictionary of Mining, Mineral, and Related Terms

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