SAHLITE. 49 the prism splits easily in the direction of all the cleavages, but most easily in the direction of the terminal planes ; in augite, the splitting is effected with difficulty in every direction, hut with the greatest difficulty in the direction of the terminal planes of the prism : the cross fracture of sahlite is uneven and dull; that of augite, although uneven, generally inclines to conchoidal, and has a con siderable degree of lustre: the distinct concretions of sahlite have a shining surface, which is not the case with those of augite: lastly, it contains more lime and mag nesia, and less iron, than augite. 2. It was first observed and described by M. D’An- drada of .Lisbon, who named it Sahlite, from Sala, the place where he first found It. 2. Augite *. Augit, Werner, This species is divided into two subspecies, viz. Com mon Augite, and Coccolite. Vo1 " IL I) First Augite is the name applied to a shining stone by Pliny, and is derived from the Greek word lustre.
