1889. | NEW YORK ACADEMY OF SCIENCES. 57 
Pyrite occurs associated with the iron ore (magnetite) and 
with massive calcite. It has been noticed, however, and not 
without reason, that the best developed and best preserved 
specimens are found in a massive calcite, which, on account of 
the dissemination through it of amphibole-byssolite, I prefer to 
term dyssolitic calcite ; pyrite exists here in many forms, but, 
unfortunately, on account of the poor development, many have 
been indeterminable. Some of the planes determined with ac- 
curacy are: 
1, H(O), 2-2, i, 2-2 
oe ae 2-8) 
A few combinations as follows: 
OR 3s ONZ OAL 
OAi-i LAPrR40AI1 
Some perfect cubes were 28 mm. in diam., and octahedrons as 
large as 45 mm. have been found. 
Chalcopyrite occurs in the same shaft and in the same manner 
as pyrite. Itis generally found in single and grouped sphenoids. 
I have noticed some wonderfully large, perfect single crystals 
30 mm. across. The parallelism noticed by Mr. Chamberlin is 
developed on a grand scale, and I have seen perfect crystals in 
groups which measured two feet square. I have also noticed a 
single specimen of chalcopyrite pseudomorphous after pyroxene. 
Apophyllite occurs in well-defined, generally modified crystals 
up to 14 mm. square. Shafts 2 and 3 produce the best speci- 
mens. Groups fully as large as the chalcopyrite (2 ft. square) 
have been taken from the mine. 
One of the largest crystals in my possession has the form O, 
1,i-i. Other planes are I, i-2; and crystals like Fig. 387 in 
Dana are frequently met with. 
An analysis made last April afforded me 
SiO, 51.63 
CaO —.5.42 
K,O 6.27 
HO 16.58 
99.90 
Sp. gr. 2.35. 
Iron Apophyllite occurs quite abundantly in massive forms; 
color, light pink. 
Stilbite occurs sparingly in shaft No. 1 in crystals, generally 
of small size, lining cavities and associated with calcite. The 
i-i—i-i prism predominates. The larger crystals are imperfect. 
