A Descriptionof a new Mineral. Species. 79 
compared with those of phosphate of lime, in Haiiy’s Mineralogy, 
Pl. xxx. Fig. 72, from which he found them to differ in value. Mr. 
Clemson, of the School of Mines, wishing to analyze the mineral, I. 
gave him all the remaining crystals of the stock I carried out with 
me. 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 [ 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 analeime 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, terminated at each extremity, by six-si- 
ded pyramids, whichare replaced, at their summits, by little hexahedral 
tables. Some of the crystals have transverse strie 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. 
ave 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 <.¥BQ9 
Mon P 90° 
