calcareous

adj

1. Resembling, containing, or composed of calcium carbonate or limestone; chalky.

   “The next morning I went to see the hot-springs and mud volcanoes, for which this place is celebrated. A picturesque path among plantations and ravines brought us to a beautiful circular basin about forty feet in diameter, bordered by a calcareous ledge, so uniform and truly curved, that it looked like a work of art.”

   “The traveller from the coast, who, after plodding northward for a score of miles over calcareous downs and corn-lands, suddenly reaches the verge of one of these escarpments[.]”

   “Cellariiform, the orifices nearly confined to the convex frontal and lateral surfaces; the basal surface with a strong median calcareous keel, almost concealed by a flat membranous epitheca, which covers the whole zoarium […]”

   “Instead, the spoil will be used in part to create 127 hectares of new calcareous grassland (alkaline grassland), woodland, wood pasture, and wetland habitats.”

2. Growing in a chalky habitat.