SCHORL. ; J*7 Smooth and fhining : fometimes the planes on one ex- h’emity are fmooth, but exp the other rough. The cryltals are feldom large, more commonly middle fized and fmall, and fometimes fcopiformly a Sgregated, as is the cafe with the red variety from Siberia. They are ufually imbedded. Eternally its luflre is fplendent and vitreous. Crofs fracture has a tendency to foliated, and the appear, to be a little inclined to the axis; lon- Sttudinal fradure is perfectly cohchoidal, particularly 111 ( he tranflucent varieties. ^Vhen, .it verges on common fchorl it prefents prif- *’ at K concretions. ^ alternates from nearly opaque to completely parent. . . ' Some varieties, when viewed in a direction oblique ^tlie ax j s 0 f jho cryftal, are tranfparent, but in the | re dion of the axis opaque: others again ex- ‘‘bit different colours according to the direction in ' v hidr they are held *. ^ard, but in a higher degree than quartz. Tafdy frangible. ^termediate between not particularly heavy, and 'C'dVy, Specific gravity-^Green tourmaline 3,006, Werner.— —From 3,0863 to 3,3626, Hatty. Blue Saline 3,133, Werner—3,130, ErJJ'on. * tv. j B , <;rller Has in his poiTcfiion a toiunnaline which is fey blue v n.icdle, but violet blue on the tides. Chemical