Definitions for: Heavy Spar

[n] a white or colorless mineral (BaSO4); the main source of barium

Webster (1913) Definition: Heav"y spar` (Min.)
Native barium sulphate or barite, -- so called because of its
high specific gravity as compared with other non-metallic
minerals.

Synonyms: barite, barium sulphate, barytes

See Also: atomic number 56, Ba, barium, mineral