CALCITES OF NEW YORK Tit i 
SUMMARY OF MEASURED AND CALCULATED ANGLES 
| 
LETTER ANGLE NO. OF | MeasURED | CALCULATED 
READINGS | | 
aes G2 ORS Se lbss id 12 WA 12 23 
a, 5 If 4041 :8.8.16.3 6 29 1S th “WE 14 
Pecrss HOM 2B Oewsieal 2 4] 8 ; 40 56 
Dae im. 1011 : 4041 + 31 1 ers 104 
isa. § inal. 4041 : 4401 2 114 14 | 114 10 
p. 23. 1011 : 0112 2 70) 2k One 
Dp. 29. 1011 : 0221 1 Or 80. | soy 434 
Denes 1011 : 6178 5 i 37 7 434 
Kee: ZASileea2 oie 5) 79 2A | 15 22 
K:: K: M131 : 3121 4 3 41 | 35 36 
M:: M: 74.1 oat = Yl as 2 73 544 | 73 40 
NES 3 AEE Teele Sashes 1 40 te  -4O 4 
M::M: CoA UGS Sho WLR 3 39 3 | Be) ill 
m. : 9): 4041 :19.10.29.6 8 19 214 | 19 17 
Y): : Y: 19-105 29.6 = 19229. 10-6 1 77 GM Ee 44 
Byte 3): 1120 : 19.10.29.6 2 16 364 | 16 44 
0:0 123 3 S2T I 1 75 34 | 15 22 
0:0 U2 3 Wael + 39) 5) 35 36 
BE HE Sel ISe2 sal Seiler 2 101 40) 101 4 
ipa Seelam Gee romltoe Loree 6 il, Oyama manly 46 
alee Lt ZOE or lomtse2 6 21 o4 | 22 7 
HOWES CAVE, SCHOHARIE CO. 
Plates 21, 22 
Calcite occurs at Howes Cave in brilliant transparent crystals 
filling or partly filling the veins in the Rondout limestone. The speci- 
mens which form the basis for the following notes were collected through 
the courtesy of the Helderberg Cement Co., from the mine in the 
Rondout limestone’ which formerly furnished natural cement rock to this 
company. The crystals which vary in size from 60 millimeters in diameter 
to microscopic individuals are of more or less uniform habit and are invari- 
ably characterized by a marked twinning parallel to 8.(0112). They are 
frequently associated with tufted aggregates of acicular aragonite which 
appears, in one instance at least, to have been derived from the re-solution 
of the calcite. In the instance noted a geodic mass almost completely 
filled with crystallized calcite yielded on fracture several fine tufts of arago- 
