A Description of a new Mineral Species. 



79 



compared with those of phosphate of lime, in Haiiy's Mineralogy, 

 PI. XXX. Fig. 72, from which he found them to differ in value. Mr. 

 Clerason, of the School of Mines, wishing to analyze the mineral, I 

 gave him all the remaining crystals of the stock I carried out with 

 rae. His analysis, however, was interrupted by an accident that 

 happened in the laboratory of the school, and the specimen was lost. 

 Being satisfied, from the examination I had made of this mineral, 

 that it was new, and not having time to analyze it myself, I furnished 

 Mr. Hayes with all the crystals I could spare from my specimens, to 

 which Mr. Alger added some obtained from Mr. Nuttall. Mr. Hayes 

 has at length completed his analysis, which he now presents to the 

 public. This accomplished chemist is too well known to the scienti- 

 fic world to require any praise from me. 



The mineral under consideration was found at Cape Blomidon, in 

 Nova Scotia, beneath a precipice of basaltic rocks, from which it 

 had recently fallen, with a large vein of stilbite, mesotype, and anal- 

 cime. The crystals are generally implanted in the analcime or stil- 

 bite. Some of them are colorless, transparent, and extremely bril- 

 liant ; others are of a salmon red color, and translucent only. — The 

 color being irregularly disseminated, it is evidently accidental. Its 

 hardness is nearly the same as that of felspar, which it scratches with 

 difficulty, being itself powdered by the friction. Specific gravity, as 

 determined by Mr. Hayes=2.169. The crystals have generally the 

 form of low six-sided prisms, terminate'd at each extremity, by six-si- 

 ded pyramids, which are replaced, at their summits, by little hexahedral 

 tables. Some of the crystals have transverse striae on the sides of the 

 prism, which I at first thought indicated a rhomboid for the primary 

 form. But the plane terminations indicate a six-sided prism, which, 

 from the direction of the natural joints, made visible by heating the 

 crystal, seems to be its primary form. 



I have not succeeded in obtaining the nucleus by cleavage, the 

 mineral breaking with a vitreous fracture in all directions, from the 

 intimate connexion of its particles. 



The angles of this mineral, as de- 

 termined by myself with the common 

 goniometer, are 



M on M' or M'' 120° 

 M on X 130° 



M on P 90° 



