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49& CALC GENUS. v More or Iefs tranflucent. Semi-hard, • In its other charaders it refembles the preceding fubfpecies. Geognostic Situation. Occurs only in fmall veins. Ob/ervations. 1. It has a confiderable refemblance to fibrous gypfum, from which it is diftinguifhed, however, by its l'uperior hardnefs, and flurper afped. 2. It has been fometimes confounded with zeolite ; but it is fufficiently dift.ingui.'hed from it by its inferior luftre, greater hardnefs and fpecific gravity, and its never occurring with a diverging fibrous fradure- 3* I he fattiu fpar fuund in Derbyfhire belongs to rhis kind. b. Calc