fersmite

fersmite

[′fərz‚mīt]
(mineralogy)
(Ca,Ce)(Cb,Ti)2(O,F)6 A black mineral composed of an oxide and fluoride of calcium and columbium with cerium and titanium.
References in periodicals archive ?
Since the beginning of the 20th century it has been a fruitful collecting area, yielding fine crystals of euxenite, gadolinite, allanite, aeschynite, fersmite and many other species from its rare-earth-enriched pegmatites.
6]] and fersmite are occasionally found associated with stibiotantalite as alteration products; the Himalaya mine is the type locality for rynersonite (Foord, 1976, 1977; Foord and Mrose, 1978).