polyhalite

About 0.01 uses per million words.

Meaning

1. noun 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.

Similar words

hydrohalite polyhydrite hillite halotrichite sulphohalite humite hyalophane cryptohalite amarillite lithosite

Often followed by

and is in at are was beds