nPolyhalite(Min) A mineral usually occurring in fibrous masses, of a brick-red color, being tinged with iron, and consisting chiefly of the sulphates of lime, magnesia, and soda.
Century Dictionary and Cyclopedia
polyhaliteA mineral or salt occurring in masses of a fibrous structure, of a brick-red color, being tinged with iron. It is a hydrous sulphate of calcium, magnesium, and potassium. It is found at Ischl in Austria, and also at Berchtesgaden in Bavaria.