04 NEW YORK STATE MUSEUM 
scalenohedron T:(4371) in the zone [1011.1120]. This scalenohedron is 
terminated by the basal plane o (0001) and is modified on the basal edges by 
planes of the prism a (1120). Both of the latter forms are well developed; 
all the faces of this combination gave fair reflections of the goniometer signal. 
The forms noted on the three types of the occurrence are: 
a (1120), b (1010), 8. (0112), r: (29.19.48.10), new, T: (4371), p: (1341) 
and e: (9.11.20.4). 
SUMMARY OF MEASURED AND CALCULATED ANGLES 
LETTER ANGLE Neen: MEASURED | CALCULATED 
: READINGS 
fo) / 10} / 
riir 29.19.48.10 : 48.19.29.10 3 AA 38 al Ad 55 
rita 29.19.48.10 : 1120 10 15 83 | 15 13 
ee A 4371 : 4731 4 B04 | GS 21 
aes oa 4371 : 7341 5 MO AGE | 26) 50 
pry 1341 : 1431 1 WOE 23 444 
pia 1341 : 1120 5 DO aaa gel eo? 21 
e: :e 9.11.20.4 :9.20.17.4 1 Pinas 230u dl ceil 33 
e: 28 9.11.20.4 : 0112 6 1. FO. BB 55 
MINEVILLE, ESSEX CO. ~ 
Plate 13, figures 5, 6 
Small crystals of calcite occur on several specimens from the Cook 
shaft, Fischer hill, Mineville, which were collected by Dr John C. Smock 
and which form part of a large series illustrating New York iron ores. The 
crystals which average 8 millimeters in vertical length form a secondary 
deposit in veins in gneiss, the latter more or less thickly impregnated with 
magnetite. As in the case of the Arnold Hill calcite veins the primary 
vein filling consists of cryptocrystalline quartz of a jasper phase which hes 
in immediate contact with the walls of the veins. In most instances the 
secondary calcite completely fills the remaining space, the crystals inter- 
locking in the center. Crystals suitable for determination were obtained 
from the thick aggregates which protrude into the open spaces formed by 
the widening of the veins. In no instance were doubly terminated indi- 
viduals obtainable. 
