Alunite
a mineral, a hydrous sulfate of potassium and aluminum, KAl 3 (SO 4) 2 (OH) 6 , commonly occurring in fine-grained masses.
Historical Examples
Of other natural mineral sources, alunite is the most important.
The Economic Aspect of Geology C. K. Leith
One of the interesting features of this occurrence is the abundance of alunite.
The Economic Aspect of Geology C. K. Leith
alunite is a potassium-aluminum sulphate, which differs from sericite in that sulphur takes the place of silicon.
The Economic Aspect of Geology C. K. Leith
alunite, al′un-īt, n. a mineral consisting of common alum together with normal hydrate of aluminium.
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various
In the Goldfield camp (p. 230) the ores are closely associated with alunite in such a manner as to suggest a common origin.
The Economic Aspect of Geology C. K. Leith
alunite occurs as veins and replacement deposits, often in igneous associations, and is supposed to be of igneous source.
The Economic Aspect of Geology C. K. Leith
noun
a white, grey, or reddish mineral consisting of hydrated aluminium sulphate. It occurs in volcanic igneous rocks and is a source of potassium and aluminium compounds. Formula: KAl3(SO4)2(OH)6
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variant of , especially before a vowel.
- Alumina
the natural or synthetic oxide of aluminum, Al 2 O 3 , occurring in nature in a pure crystal form as corundum. Historical Examples The garnet is but as hard as quartz, and is a silicate of alumina with lime and a little iron. The A B C of Mining Charles A. Bramble It is […]
- Alumina cement
a quick-setting cement with a large bauxite content.
- Alumina trihydrate
. a crystalline, water-insoluble powder, Al(OH) 3 or Al 2 O 3 ⋅3H 2 O, obtained chiefly from bauxite: used in the manufacture of glass, ceramics, and printing inks, in dyeing, and in medicine as an antacid and in the treatment of ulcers.
- Aluminum
Chemistry. a silver-white metallic element, light in weight, ductile, malleable, and not readily corroded or tarnished, occurring combined in nature in igneous rock, shale, clay, and most soil: used in alloys and for lightweight utensils, castings, airplane parts, etc. Symbol: Al; atomic weight: 26.98; atomic number: 13; specific gravity: 2.70 at 20°C. Abbreviation: alum.; of, […]