alunogenn.
/əˈl(j)uːnədʒ(ə)n/, U.S. /əˈlunədʒ(ə)n/ Mineralogy.
A mineral consisting of hydrated aluminium sulphate, typically occurring as masses of feathery or fibrous crystals. Cf. feather-alum n. at feather n. Compounds 2a, hair-salt n. at hair n. Compounds 2.Chemical formula: Al2(SO4)3·17H2O. Crystal system: triclinic.
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the world > the earth > minerals > types of mineral > sulphates > [noun] > alum > feather alum
alum plumec1425
plume alum1600
feather-alum1693
plumose alum1732
alunogen1834
1834 W. Ainsworth Caves Ballybunian 85 The fourth or feather-like variety of Katherite, alun de plume introduced in the appendix to Alunogene, by Beudant.
1844 J. D. Dana Syst. Mineral. (ed. 2) 215 The alunogen of Beudant..is both the result of volcanic action and of the decomposition of pyrites.
1891 Bull. U.S. Geol. Surv. No. 74. 82 I have once seen a beautiful specimen of fibrous, silky alunogen from the western counties, but could not learn the exact locality from which it came.
1938 Philos. Trans. (Royal Soc.) B. 229 41 Some of the alunogen is mixed with aggregates of minute greenish yellow crystals.
1994 A. Theroux Primary Colors 166 To get red yarn, Zunis usually soak the yarn for three days in alunogen and native lime [etc.].
2009 G. Rapp Archaeomineralogy (ed. 2) x. 231 They [sc. the Romans] also knew of the mineral alunogen..and utilized a number of minerals with aluminum sulfate or compounds similar to alum.
This entry has been updated (OED Third Edition, September 2012; most recently modified version published online March 2022).
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