polyhalite

polyhalite (uncountable)

1. (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.
   • 2019 October, James Abbott, “Esk Valley revival”, in Modern Railways, page 76:

     Shafts are now being sunk at Sirius Minerals' Woodsmith mine to extract polyhalite for use as an agricultural fertiliser, with much of the output exported.

• David Barthelmy (1997–2024) “Polyhalite”, in Webmineral Mineralogy Database.
• “polyhalite”, in Mindat.org‎, Hudson Institute of Mineralogy, 2000–2024.
• “polyhalite”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.
• “polyhalite”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.

• lyophilate, polythelia