acid spar
acid spar
[′as·əd ‚spär] (mineralogy)
A grade of fluorspar containing over 98% CaF2 and no more than 1% SiO2; produced by flotation; used for the production of hydrofluoric acid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.