40 Whitney’s Chemical Examination 
Ill. ANALYSES OF PECTOLITE AND STELLITE, AND PROPOSED 
UNION OF THESE TWO SPECIES. 
Pectolite occurs on Isle Royale, Lake Superior, in spheroidal 
masses, consisting of delicate silky fibres radiating from a 
centre, which exactly resemble the foreign specimens of this 
mineral from Monte Baldo. The radiated, stellated mineral 
from Bergen Hill, N. J., which was analyzed by Beck, and 
supposed by him to be identical with the stellite of Thomson, 
agrees also in external characters with the pectolite. — Speci- 
mens from Isle Royale and from Bergen Hill fuse, like pecto- 
lite, readily, with but little intumescence, to a blebby colorless 
glass. 'They are easily dissolved by chlorohydric acid, the 
silica separating as a flocky powder. 
The following are the results of the analysis of specimens 
of the pectolite and stellite. 
L IL III. 1%. 
Silica 53.45 55.66 54.00 55.00 
Lime 31.21 32.86 32.10 32.53 
Soda hod 7.91 8.89 9.12 
Potash trace trace 
Alumina 4.94 145 Mn 1.90 Ma 1.10 
Water 2.72 "Arp 9.96 M i9 
99.69 100.00 99.85 r.s.x. 101.10 6.7.5. 
I. and II. are specimens from Isle Royale. No. I. con- 
tains a considerable portion of alumina, which is evidently 
not essential to the composition of the mineral, since II., re- 
sembling it entirely in external appearance, gives only one and 
a half per cent. The silica in both these analyses contained 
a small quantity of substance insoluble in carbonate of soda; 
evidently quartz mechanically intermixed with the finely fibrous 
mineral. 
III. is the mineral from Bergen Hill, N. J., analyzed by Beck, 
He has erroneously given 6.8 per cent. of magnesia in this 
