274 Brush and Dana—the Spodumene of Branchviile, Conn., 
feldspar is obtained in cleavage masses as large as can be han 
dled, and nearly pure; a single continuous cleavage nurinod 
ten feet long has been observed in the ledge 
6. igs illinite. 
ordinarily included among the pinite group of minerals. 
escribed from Killiney Bay, Ireland, and a series 
by Mr. Julien as occurring at Chesterfield, Mass. Our results, 
which we give here, are for the most part identical with his. 
The killinite ratey ‘predehville is sometimes compact and 
structureless, but more generally it has an indistinct fibrous 
structure parallel to the prism of the original mineral. Man 
et es sat distinctly the cleavages of the original spodu- 
The color ranges through various shades of A ie rom 
light bluish- maaan to oil-green and dark grass-gree 
Two analyses, on independent material, have bein made for 
us; the first, number 1, is by Mr. S. L. Penfield, of the pris- 
matic variety ; and the other, number 2, is by Mr. F. P. Dewe ey; 
of the compact variety. 
No.1 No.2 
Sid, 48°93 53°47 
Al,Os 34°72 32°36 
Fe,0; 0°54 7 
FeO 0°33 0°42 
MnO 0°64 0-72 
CaO eee 0-17 
K,0 9°64 7-68 
Na,O 0°35 0°44 
Li,O Ewen 0-04 
H,O 5-04 4°07 
100°19 100°16 
The two analyses show a rather wide variation in composition 
between the material analyzed in - two cases. If, raoevagts 
the analyses referred to above as published by G 
Lettsom be compared together, and with that of Mr. lial 
from Chesterfield Hollow and those here given, it will be seen 
that they vary between quite wide limits. i cannot be doubted, 
however, that essentially the same material was under examin- 
ation in the several cases, and that the eerie noted is prob- 
ably due to a want of homo eneity. 
Killinite gives water in the closed tube. B. B. glows . 
fuses at meh 5 to a white enamel. Not decomposed b 
hydrochloric ac 
Several paereance of killinite were examined in the micro- 
scope. The parallel fibrous structure is there clearly seen and 
