Martial Muriatic Spar. 145 Keffekill or myrfen, which the Germans cor- ruptly call Meerfchaum, is faid to be when re- cently dug of a yellow colour, and as tenacious as cheefe or wax. By the lateft accounts it is found near Burza in lower Afia *. It is the fubftance of which the large Turkey tobacco pipes are formed. It is faid to be the earth called in Canada terre a cbalumeau, but of this I dotibt. When boiled vvith greafe it is formed into pipes, and hardens in theopen air. The fcrapings ofthefe pipes wereexa- mined by Mr. Weigleb, and found to confift of 4 filex and 4 magnefia nearly; the magnefiadid not effervefce with acids, this was probably occafion- ed by the expulfion of fixed air during the treat- ment with fat. To this alfo the hardnefs may perhaps be afcribed, as magnefia and filex will notbarden cven in a porcelain heat. 3 Grell. N. Entdeck. 3.8. By the heat of pure air this fub ftance is converted into a white porcelain mafs. Note, Baron Born, 1 Raab 2^4, confiders thig earth as a femi indurated talc. 2d Family. Martial Muriatic Spar. Mr. Monnet, a mineralogiftof confiderable note, lately difcovered this ftone at St. Man aux Mines, and called it pifolites; but, as a very different com pound is generally denoted by this name, I have called it martial muriaüc fpar, a name which agrees betrer with its propcrties. It is of a hard, folid, and fparry texture, of a * N. Aüi. Petropol. 1785. 363. L grey»