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iron alum
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iron alum
iron alum a. Min. A double sulphate of iron and aluminium (see alum n. 2), occurring native as halotrichite. b. Chem. A double sulphate of iron and potassium (or ammonium), belonging to the series of alums in the extended sense: see alum n. 3).1868 Dana Min. 654 Halotrichite..Iron Alum. 1868–72 Watt...
Oxford English Dictionary
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Ammonium iron(III) sulfate
Ammonium iron(III) sulfate, NH4Fe(SO4)2·12 H2O, or NH4[Fe(H2O)6](SO4)2·6 H2O, also known as ferric ammonium sulfate (FAS) or iron alum, is a double salt Gallery
References
Ammonium compounds
Iron(III) compounds
Sulfates
Double salts
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Alum
Alum described in medieval texts
Alum and green vitriol (iron sulfate) both have sweetish and astringent taste, and they had overlapping uses. (apjohnite), magnesium (pickingerite) or iron (halotrichite or feather alum), and is a trivalent metal ion.
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halotrichite
halotrichite Min. (hæˈlɒtrɪkaɪt) [Named by Glocker, 1839, f. as prec. + -ite.] Iron alum, occurring in yellowish-white, fibrous masses.1849 Nicol Min. 323. 1868 Dana Min. (ed. 5) 654 Halotrichite, Silky fibrous. Yellowish-white. Taste inky-astringent. 1875 Plattner Blowpipe 208 Halotrichite fuses in...
Oxford English Dictionary
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Alunogen
Alunogen (from French alun, “alum”), also called feather alum and hair salt is a colourless to white (although often coloured by impurities, such as iron It occurs associated with pyrite, marcasite, halotrichite, pickeringite, epsomite, potash alum, melanterite and gypsum.
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alum
▪ I. alum, n. (ˈæləm) Forms: 4 alem, 4–5 alym, 4–8 alom, 5–7 alume, alome, 6 alme, 6–7 allume, 6–8 allom(e, allum, 4– alum. [a. OFr. alum:—L. alūmen, the same substance: cf. alūta tawed skin.] 1. A whitish transparent mineral salt, crystallizing in octahedrons, very astringent, used in dyeing, tawin...
Oxford English Dictionary
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Alunite
It was first observed in the 15th century at Tolfa, near Rome, where it was mined for the manufacture of alum. First called aluminilite by J.C. Alunite occurs as a secondary mineral on iron sulfate ores.
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roemerite
roemerite Min. (ˈrɜːməraɪt) Also römerite. [ad. G. römerit (J. Grailich 1858, in Sitzungsber. d. K. Akad. d. Wissensch. in Wien XXVIII. 272), f. the name of Friedrich Adolph Römer (1809–69), German geologist: see -ite1.] A hydrated sulphate of ferrous and ferric iron, often containing zinc, which oc...
Oxford English Dictionary
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Alum Bay
The sands are coloured due to oxidised iron compounds formed under different conditions. Guglielmo Marconi moved to Alum Bay in 1897 to experiment with radio. He installed a 40-metre radio antenna outside the Needles Hotel in Alum Bay.
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Rock butter
Rock butter (also known as stone butter) is a soft mineral substance found oozing from alum slates. It consists of native alum mixed with clay and oxide of iron, usually in soft masses of a yellowish white colour, occurring in cavities and fissures in
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Halotrichite
Halotrichite, also known as feather alum, is a highly hydrated sulfate of aluminium and iron. Its chemical formula is FeAl2(SO4)4·22H2O. Gallery
References
Saint-Hilaire
Mineral Atlas
Iron(II) minerals
Aluminium minerals
Sulfate minerals
Monoclinic minerals
Minerals in space group 14
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Mineral spring
Chalybeate springs contained salts of iron.
Alum springs contained alum.
Sulfur springs contained hydrogen sulfide gas (see also fumeroles). Chaybeate springs may deposit iron compounds such as limonite. Some such deposits were large enough to be mined as iron ore.
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Aluminium sulfate
Aluminium sulfate is sometimes called alum or papermaker's alum in certain industries. schists
The alum schists employed in the manufacture of aluminium sulfate are mixtures of iron pyrite, aluminium silicate and various bituminous substances
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