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the world > the earth > minerals > types of mineral > sulphates > [noun] > alum (17)
aluma1398

An astringent mineral salt, typically occurring as colourless or whitish crystals, that is used as a mordant for dyeing, in tanning, for sizing…

alumen?a1425

The mineral alum (alum, n.1).

Subcategories:

— halotrichite (2)
— feather alum (5)
— Roman alum (2)
— other alums (6)
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