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COMMON AUG1TE. .57 lefer to the foliated augite, and Hauy to hornblende. As far as I can judge from the accounts published by mineralogists, it appears to be very nearly allied to au gite ; yet the following description shews that it cannot well be arranged either with augite or hornblende. “ Co lour generally dark greenish-black, seldom velvet-black. Occurs massive and disseminated. Internally specu lar-splendent on the principal fracture, and the lustre intermediate between resinous and vitreous. Fracture perfect and straight foliated, with double oblique an gular cleavage, under an angle of 55° ; cross fracture conchoidal. Fragments very sharp-edged. Equally hard with augite. Specific gravity, 3.085, Klaproth. It melts with difficulty into an uniform olive-green, opaque, and shining slag. Silica, 52.52. Alumina, 7.25. Mag nesia, 12.50. Lime, 9.00. Potash, 0.50. Oxide of iron, 10.25.” Klaproth, Beit. B. iv. s. 189. It is found in the Saualp in Carinthia, in a bed in primitive rocks, along with quartz, cyanite, garnet and zoisite. It is distinguished from Augite by its splendent lustre, per fect conchoidal cross fracture, more perfect foliated frac ture, different cleavage, and inferior weight: from Horn blende by its stronger lustre, and kind of lustre, perfect conchoidal cross fracture, greater hardness, and the ac tion of the blowpipe on it *. 4. Karsten describes a mineral, under the name Slaggy Augite, (Schlackiger Augite), in Klaproth’s Beitrage, vol. iv. p. 190. It is by some referred to the Conchoidal Augite of Werner, but which differs from augite in spe cific * Vid. Karsten, in Klap. Beit. b. iii. s. 185.; Karsten, Tabcl, s. 40.; Hauy, Annales du Mus. t. xiv. p. 890.; Leonhard, Taschenbuch, b. iv, s. 132.
