from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a water-soluble mineral, ammonium aluminium sulphate (NH4)Al(SO4)2·12(H2O) found in fumaroles and similar environments
from The Century Dictionary and Cyclopedia
- n. Same as ammonialum.
Sorry, no etymologies found.
The ground surface contains efflorescent salts such as alum, a hydrated potassium sulfate, tschermigite, a hydrated ammonium sulfate, gypsum and clays such as illite and montmorillonite.