Erlefenßein. 91 The browner forts are I believe moft frequently marls or marlites, yth Family, Oviform. Erlefenßein. Their colour is general^ yellowifh grey, or brown. Luftre o. Tranfparency o or 1. They confift of a number of globules clofely compaded together J their hardnefs from 6 to 7. 3 d Species. Mild calcareous earth, mixed with a notable proportion of other earths, iron, or manganefe. Mixed with barytes or barofelenite. Baryto- Calcite. Of this ftone, which I have not feen, Mr. Bcrgman gives the following acGount *. lts colour, dark or light grey, abnort white. Tranfparency 2. Form, either that of a wedge, or fome feg** ment of a fphere, or rounded, or cryftallized in quadrangular prifms. Fradure ftriated, and prefents feparate colum- nar concretions, more or lefs diverging as trom a common centcr. It contains 92 per ct. of aerated calx, and 8 of aerated barytes. Spec. graw not given, but I conjedture it to be nearly 2,7s. ]t eßervefees with acids. * j Chy. An. 1734, 388. 4:h Species.