from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An aluminium sulfate mineral often found on the walls of mines and quarries.
from the GNU version of the Collaborative International Dictionary of English
- n. A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt.
from The Century Dictionary and Cyclopedia
- n. Native aluminium sulphate, occurring in fine capillary fibers, and consisting of 36.05 parts of sulphuric acid, 15.40 of alumina, and 48.55 of water.
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