Note on Aventurine Orthoclase. 4838 
PuaTEe No, 1. PLATE No. 2. 
June 27, 1870. Therm. 74°. | June 27, 1870. Therm, 74°. 
Wei. Wet. 
Line No. 1, Line No.2. Line No.1. ° Line No. 2. 
165-5500 72°1175 164°3275 71°9350 
“5470 1125 3325 “9450 
"5525 "1225 "3250 "9300 
"B5T5 “1275 "3350 “9370 
"5540 "1240 “3275 ‘9475 
165°5522 72°1208 164°3295 71-9388 
72-1208 71-9388 
93°4314 92°3907 
+10 Therm. Cor. +10 Therm. Cor. 
93-4324 92°3917 
: Dry. Therm. 72°, Dry. Therm. 72°. 
165-1125 716850 163°9075 715100 
"1150 “6880 “9000 50 
1175 6890 9100 00 
1175 "6850 9025 50 
1125 6860 50 
165-1150 71°6866 163-9045 71°5130 
71-6866 . 715130 
93°4284 92-3915 
+7 Therm. Cor, + Therm. Cor. 
93°4291 Dry —R.0-0033 923922 Dry + R.0°0005 
Plate No. 1. June 27. Therm. 74° and 72° Dry—R. 0-0033 
ae a. % re ns “ 74° and 72° “ +R. 0°0005 
“ No.3 July 3. “ 82° and 83° “ +R. 0°0004 
SNe Se “« 84° and 85° “* +R. 0:0007 
ee i “ot ona wa 6 64. 0-009 
NG. 6 we BS ge" and 80" “ ER, 00092 
= Nog: 10-98 wae bo" = eR. 0°0059 
ae “ eee oe.  . O'0040 
> Na: 8. gee: “ 84° and 82° “ +R. 0:0089 
Mean excess of Dry, R. 0°0017=y¢4z, of an inch. 
Arr. LL—Note upon Aventurine Orthoclase, found at the Ogden 
Mine, Sparta Township, Sussex Oo., N. J.; by Prof. Lexps. 
Antone the masses of gneiss rock thrown out in sinking one 
of the oat of the Ogden mine, I found, during the course of 
€ past summer, ia panes of ve bE. pagp ad 
which appears hith ve esca The three 
cleavages O, i- and Le, rl ee obtained, par ford the cleav- 
age a of orthoclase. The ety thin plates, which may be 
procured by slicing the stone in the direction of the principal 
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