G. W. Hawes—Feldspar from Bamle in Norway. 579 
however, well deserves a careful examination, although the 
best specimens have been carried off by mere curiosity-seekers. 
It would thus seem -that the great expansion of the Conglom- 
erate on New River is not an isolated phenomenon, but that it 
is the effect of a condition of things which began in much older 
formations, and continued until a later era. The question is 
suggested: Does not the successive formation of coal on an 
extended scale, along the southwest border of the Appalachian 
coal field, commencing in the Devonian period, point to the 
existence at this time of a continental mass nearer than the 
Azoic of Canada 
Morgantown, West Virginia. 
Art. LV.—Contributions fromt the Sheffield Laboratory of Yale 
College, No. XX. On a Feldspar from Bamle in Norway ; 
by Groraze W. Hawes, Ph.B. 
ASSOCIATED, at Bamle in Norway, with the fluo-phosphate 
of magnesia and lime which has been calle 
Kjerulfine, is found a triclinic feldspar. It occurs massive, 
with two cleavages at an angle of 94°. Upon the more perfect 
cleavage surface are very fine striations. Its luster is vitreous; 
color grayish white; semi-transparent. H.=6. G.=2°67. When 
heated it phosphoresces with a white light and fuses, at about 
three, to a translucent glass. It is unacted upon by acids, until 
boiled for a long time, and then but slightly. When heated 
in a matrass, the tube is dimmed by moisture. The analyses 
were made according to the usual methods, and gave 
I. . 
Silica, cis ye BOO 66°05 
AGW oe iets ace 20°33 20°41 
Metric 68106... 40. “29 28 
Lime, -.. 1-29 1°30 
WR ce i Sg A 1°08 
Potash, “21 “21 
DOCS. .. 505 6 2 ae 10°01 9°81 
Ignition 4 "95 "96 
100°23 100°10 
Oxygen ratio for R, ®, Si, 1:2°8:10. ; 
This analysis shows the mineral to be near oligoclase, if not 
identical with that species. Its association and its physical 
properties are the same as those given by v. Kobell for Tscher- 
makite, recently described as a new species of feldspar.* In 
the specimens examined, which were the cabinet of Prof. 
Brush, the feldspar occurred in quite large fragments, so that 
it was possible to extract it in a state of purity. 
* Ber. Ak. Miinchen, Dec., 1873; this Journal, March, 1874. 
