Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
- (mineralogy) 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.
- “Polyhalite” in David Barthelmy, Webmineral Mineralogy Database, 1997–.
- polyhalite mindat.org, Hudson Institute of Mineralogy, accessed 29 August 2016
- polyhalite in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913