leonite

Century Dictionary and Cyclopedia

1. n. A hydrated sulphate of potassium and magnesium, K₂SO₄.MgSO₄ + 4H₂O, analogous to blödite in formula, and hence also called kaliblödite. It occurs in massive form, rarely in monoclinic crystals, in the salt regions of Leo-poldshall and Westeregeln, Germany.

Wiktionary

1. n. mineralogy A saline evaporite, consisting of a mixed potassium and magnesium sulphate, with the chemical formula (K2SO4)(MgSO4)