Gypsum Rock - National Gypsum Company, Drywall, Cement Board .The largest gypsum quarry in the world is located in Nova Scotia and is owned by National Gypsum. National . Gypsum Rock. Gypsum (jip'sum), mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water,.address of national gysum s halifax gypsum rock quarry,Halifax Quarry - National Gypsum HistoryNational Gypsum purchased plats of land near Halifax, Nova Scotia, in 1954, securing its place . "Our goal is to guarantee rock purity at 89 percent," Mills said.
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