( 90 ) XX. DOLOMITE FAMILY. This Family contains the following species: Dolomite, Brown-Spar, Miemite, and Gurhofite. I 1. Dolomite. Dolomit, Werner. ' * This species is divided into four subspecies, viz. Com mon Dolomite, Dolomite-Spar or Ithomb-Spar, Columnar Dolomite, and Compact Dolomite or Magnesian Lime stone. First Subspecies. Common Dolomite. Gemeiner Dolomit, Lenz. External Characters. Its colours are snow, greyish, yellowish, and bluish white; greenish and bluish grey, and pale leek-green. It occurs massive, in rolled pieces, and in loose grains. Internally it is sometimes shining, sometimes glimmer- The fracture in the large is imperfect curved slaty; in the small, common or scaly foliated, sometimes passing into splintery, and almost into uneven. The fragments are rather blunt-edged. It occurs in fine granular concretions, which are some times so loosely aggregated, that the mass is flexible.
