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Heavy Spar :: Heavy spar () Native barium sulphate or barite, -- so called because of its high specific gravity as compared with other non-metallic minerals..

Barite :: Barite (n.) Native sulphate of barium, a mineral occurring in transparent, colorless, white to yellow crystals (generally tabular), also in granular form, and in compact massive forms resembling marble. It has a high specific gravity, and hence is often called heavy spar. It is a common mineral in metallic veins..

Cawk :: Cawk (n.) An opaque, compact variety of barite, or heavy spar..

Barytes :: Barytes (n.) Barium sulphate, generally called heavy spar or barite. See Barite..

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