7 6 v Calcareous Gcms, ift Clafs. Mild calx in a loofe or femi-indurated form. i ft Family. Agaric mineral, bergmilch or bergmehl of the Germans. ift variety. Dußy; bergmilch of Werner: lts colour is white red, or yellow formed of com- paded particles, but exceeding friable, and hence dufty: fecls dry, does nor adhere to the tongue, and fo light as nearly to float on water : eives no glofs to the fkin. 2d variety. Somezvkat vnfluous ; white, formed of fcaly particles, adheres to the tongue, very friable, feels fomewhat greafy, and gives a glofs to the fkin when rubbed 011 it, falls to dult in water, entirely foluble in nitrous acid, almoft floats on water. Lazius Hartz, 2 2H. ßoth thefe varieties are found in the clefts of rocks, or at the bottom of (ome lakes. 3d variety. Si/very cbalk. Of this I find fome, but an imperi'tdf, account in Crell’s An- nals for 1790. lts colour is filvery whire, and in its firudure it refembles mica ; it feels Jbl't and fomewhat unduous like talc, it is almoft entirely foluble in nitrous acid, and the folution has all the properties of a folution of calcareous earth ; it fcarccly diffcrs, as it leems, trom the foregoing. 2nd Family.