a. Any hydrous, alkali aluminum sulfate mineral, including kalinite,
potassium alum, sodium alum, mendozite, tschermigite, and lonecreekite.
Syn: potash alum
b. A former name for kalinite and potassium alum.
c. Any salts that are double sulfates of aluminum, chromium, iron, or
manganese and one of the alkali metals.
Source: Dictionary of Mining, Mineral, and Related Terms