Rhōmb'-spār, n.
n. A mineral resembling calc-spar in luster and crystallization, consisting of the carbonates of lime and magnesia, with some carbonate of iron. Owing to the latter, it usually turns brown on exposure. Dana.
n. A mineral resembling calc-spar in luster and crystallization, consisting of the carbonates of lime and magnesia, with some carbonate of iron. Owing to the latter, it usually turns brown on exposure. Dana.