■WPWfcäl- 4JI* V'W"' ■ - - '-f - 104 Calcareous Genus, The former is found in coal-mines, the latter is not attached to them, but contains copper ore. 2d Family. Pyritaceous Limeftone. Dark grey, or yellowifh grey. Luftre 1, from fome interpofed fhining particles. Tranfparency o. Frafture compadt, often flaty. Hardnefs from 8 to 9, brittle. Spec. grav. 2,703. Gives a grey powder, is not magnetic. Soluble in acids, and fometimes with effer- yefcence. Detonates with nitre 1 . Calcined with charcoal affords a liver of ful- phur. Diftilled, it affords fome flowers of fulphur, and volatile vitriolic acid. By the analyfis of Baron Servieres, it contains 75, P er ct - mild calx, and 25 of pyrites, con- ßfting of 14 parts argill, 7 quartz and fulphur. and 4 of iron *. 6th Species. Argentine. Schiefer fpath of Werner. > Colour greyifh, reddifh, or greenifh white. Luftre, where frefh broken, and in the direc- tion of the lamellte, 3,2, and of the lilvery kind, as I think; fome call it intermediate between thac of wax and mother of pearl. * 21 Rozier, 394, 22 Roz. 207. Tranfpa-