from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A saline evaporite, consisting of magnesium sulphate, also found in fumaroles, with the chemical formula MgSO4·7H2O.
from the GNU version of the Collaborative International Dictionary of English
- n. Native sulphate of magnesia or Epsom salt.
from The Century Dictionary and Cyclopedia
- n. Native Epsom salt, occasionally found as a delicate fibrous or capillary efflorescence on rocks, in the galleries of mines, upon the damp walls of cellars, etc. Also called hair-salt.
- n. See stylolite.
Epsom + -ite, named after the place Epsom in England in 1824. (Wiktionary)