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  1. Chalk is soft, fine-grained, whitish rock 
  2. composed of calcium carbonate, CaCO3, 
  3. extensively quarried for use in cement, lime,
  4. and mortar, and in the manufacture of 
  5. cosmetics and toothpaste.  Blackboard chalk 
  6. in fact consists of gypsum (calcium sulphate,
  7. CaSO4.2H2). 
  8.  
  9. Subject by: Russell Webb
  10.