More on heavy spar from Infoplease:

• heavy spar: meaning and definitions - heavy spar: Definition and Pronunciation
• barite - barite barite , barytes[New Lat., from barium], or heavy spar,a white, yellow, blue, red, or ...
• Suggestions for spelling of encyclopedia/heavy spar - The Infoplease spelling checker combines spelling help with our dictionary and thesaurus
• barite: meaning and definitions - barite: Definition and Pronunciation
• spar - spar. spar. For dogtooth spar, see calcite; for fluorspar, see fluorite; for heavy spar, see ...

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