CONCttOlOAL APATITE. Externally the crystals are shining and splendent, and Vitreous: internally shining or glimmering, and resmous or vitreous. The longitudinal fracture is imperfect foliated; the cross fracture flat and perfect conchoidal. The fragments are blunt-edged. It occurs in large and small granular distinct concre tions. It alternates from transparent to translucent. It is seftii-hard. It affords a greyish-white streak. It is brittle, and easily frangible. Specific gravity, 3.200, from Uto, Klaproth. 3.190, from Zillerthal, Klaproth. Chemical Characters. Some varieties of this subspecies do not phosphoresce tvhen exposed to heat. Constituent Parts. Apatite from Uto. Phosphate of Lime, 92.00 Carbonate of Lime, 6.00 Silica, - 1.00 Loss in heating, 0.50 IVlanganese a trace. 99.50 Klaproth, Beit, b. v. s. 181; Prom Zillerthal. Lime, - 53.75 Phosphoric Acid, 46.25 100 Klaproth, Beit. b. iv. s. 197. Gcognostic and Geographic Situations. Europe.—It is found in a porous iron-shot limestone' iear Cape de Gate, in Murcia in Spain; in granite, near Mantes, and in basalt at Mont Eerrier, in France ; im- edded in green talc, in the Zillerthal in Salzburg; in 0 3 beds