Tremolite. 467 Internally its luftre is fliining and gliftening, and is pearly. Frafture fometimes broad radiated, fometimes fo liated ; both are ftreaked, and the foliated appears to have a two fold longitudinally interfering cleavage, whence the frafture has a longitudinally ftreaked fur-* lace. The radiated is promifcuous and fcopiformly *adiated. Crofs frafture uneven. Fragments indeterminately angular, and approach fonietimes to the cubical. The maflive occurs in large and coarfe grained diftinft concretions, which fometimes approach to *he wedge-fhaped prifmatic. Tranflucent, but the crvftallized femi-tranfparent. Semi-hard. Pretty eafily frangible. Not particularly heavy. THIRD