Alchemy Alphabet: FEATER ALUM, Halotrichite (Halotrichum), "Salt hair". Hydrated sulfate of Aluminium and Iron: Chemical formula=[FeAl₂(SO₄)₄•22H₂O].

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Alchemy Alphabet: FEATER ALUM, Halotrichite (Halotrichum), "Salt hair", also: Alum of Lead. Hydrated sulfate of Aluminium and Iron: Chemical formula=[FeAl₂(SO₄)₄•22H₂O]. Alchemical sign, symbol, 1657.

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