ankerite

(redirected from Bitter spar)
Also found in: Dictionary, Thesaurus, Wikipedia.

ankerite

[′aŋ·kə‚rīt]
(mineralogy)
Ca(Fe,Mg,Mn)(CO3)2 A white, red, or gray iron-rich carbonate mineral associated with iron ores and found in thin veins in coal seams; specific gravity is 2.95-3.1. Also known as cleat spar.