124 LIMESTONE FAMILY. Constituent Parts. It is a pure Carbonate of Lime. Geognostic and Geographic Situations. It is found on.the north side of Oxford, between the Isis and the Cherwell, and near Chipping-Norton, also in Oxfordshire *; and in the fissures of caves of limestone mountains in Switzerland, Austria, Salzburg, and other countries. Uses. In Switzerland, where it occurs abundantly, it is used for whitening houses. Observations. 1. It is formed by water passing over and through limestone rocks, and afterwards depositing in holes, fis sures, and on faces of rocks, the calcareous earth it had dissolved in its course. 2. It is named Agaric Mineral, from its sometimes ad hering to rocks with the resemblance of a fungus or aga ric : the name Rock Milk given to it by some mineralo gists, is from its white appearance when oozing from the clefts of rocks; and the name Lac Lunce is some times given to it, from the milky-like appearance it pre sents in a cave in Phrygia; this cave, according to the tradition of the neighbourhood, having been formerly frequented by Diana •5. Chalk. * Kid's Mineralogy, vol. i. p. 39. Ibid.