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the world > the earth > minerals > types of mineral > sulphates > [noun] > alum > feather alum (5)
alum plumec1425

= plume alum n. at plume, n. compounds 2.

plume alum1600

a mineral consisting of a double sulphate of aluminium and iron, occurring as tufts of silky, fibrous crystals; = halotrichite, n.

feather-alum1693

ferroso-aluminic sulphate or halotrichite.

plumose alum1732

= plume alum n. at plume, n. compounds 2 (see also quot. 1678 at sense 1).

alunogen1834

A mineral consisting of hydrated aluminium sulphate, typically occurring as masses of feathery or fibrous crystals. Cf. feather-alum n. at feather, n.

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