alunite

/al-yuh-nahyt/US // ˈæl yəˌnaɪt //UK // (ˈæljʊˌnaɪt) //

白云石,白云岩,矾土,白云母

Definitions

n.名词 noun

1
- : a mineral, a hydrous sulfate of potassium and aluminum, KAl326, commonly occurring in fine-grained masses.

Alunite, al′un-īt, n. a mineral consisting of common alum together with normal hydrate of aluminium.
Alum-rock, or alum-stone, is a species of impure alunite, and is not of very common occurrence.
In the Goldfield camp (p. 230) the ores are closely associated with alunite in such a manner as to suggest a common origin.
Alunite is a potassium-aluminum sulphate, which differs from sericite in that sulphur takes the place of silicon.
Alunite occurs as veins and replacement deposits, often in igneous associations, and is supposed to be of igneous source.