58 TRANSACTIONS OF THE [JAN. 14, 
One large crystal measured 35 mm. in length. An analysis 
resulted as follows: 
SiO, 58.00 
Al,O, 13.40 
Ke.O. > tr: 
1aO 7.80 
MgO 1.40 
K,0 1.03 
Na.O = itr 
H,O 18.30 
99.93 
Calcite assumes a number of forms, and many planes have 
been noticed, but few definitely determined. It is found in 
greater or less quantities throughout the mine. 
Beautiful specimens of Iceland spar, equal to that from Rossie, 
N. Y., have been obtained. Another variety is iridescent, also 
good transparent scalenohedrons of a light-yellow color. 
Single rhombohedrons of large size, transparent, and of a 
dark-yellow color, have occasionally been met with. Some of 
these rhombs on apophyllite measure 15 mm. 
Another interesting form of this species is the variety bysso- 
litic calcite, in which the long acicular crystals of byssolite are 
disseminated throughout the calcite, giving it a dark-green 
appearance. 
Orthoclase. An interesting variety of orthoclase occurs in 
shaft No. 1. The crystals are columnar, and radiating from a 
centre form a sheaf-like structure. 
The largest crystals observed were 64 mm. in length; color, 
light green to light pink. 
An analysis by Dr. Genth’ gave: 
Loss by ignition 0.67 
SiO, 62.68 
Fe,O, 0.23 
ALO, 7 20:90 
CaO 0.15 
Na,O none. 
K,O 15.92 
100.62 
Sp. gr. 2,528. 
I have found asmall percentage of MnO in the green varieties. 
Pyroxene occurs both massive and crystallized, It is abun- 
1 Proc. Am. Phil. Soc., xxii., p. 43. 
