582 



JV. L. Bow en — Melting Phenomena of the 



Date Initial 



1913 Condition. 



Table II (continued). 



Temp. Temp, 

 microvolts degrees Time 



Kesult 



Amelia County albite, Ab 9 eAn 2 . 



Jan. 14 Cryst. coarse 



grains 11130 



Jan. 15 Cryst. coarse 



grains 11240 



Jan. 15 Cryst. coarse 



grains 11440 



Jan. 17 Cryst. fine 



powder , 11450 

 Jan. 18 Cryst. fine 



powder 11200 



Jan. 18 Cryst. fine 



powder 11000 



Jan. 18 Cryst. fine 



powder 10800 



Jan. 18 Cryst. fine 10700 



powder 

 Jan. 18 Cryst. fine 



powder 10600 



1133 1 hr. A very little glass. 



1143 2 hr. Glass in stringers. 



1160 1 hr. Glass in stringers. 



1161 1 hr. Much glass. 



1140 1 hr. Much glass. 



1122 1 hr. Glass in stringers. 



1105 1 hr. Glass in small stringers. 



1097 2 hrs. Doubtful slight change from 

 original. 



1913 



Jan. 15 Cryst. 



Jan. 15 Cryst. 



Jan. 15 Cryst. 



1089 2 hrs. No change. 

 Beginning of melting 1100° ± 10° 



Oligoclase from Bakersville, North Carolina.* 



AD77.5AH22' 6 



11650 1175 1 hr. Glass in stringers. 

 11530 1165 1 hr. A slight change. 

 11420 1154 1 hr. No change. 



solidns 1158° ± 5° 



Summary of Melting Intervals^ 



Composition. 



Temperature of 



Beginning of Melting. 



Solidus. 



Temperature of 



Completion of Melting. 



Liquidus. 



An 



1550° ± 2° 



1550° ± 2° 



Ab x An 6 



1465° ± 4° 



1521° ± 2° 



Ab x An 2 



1372° ± 4° 



1490° ± 2° 



A^An, 



1287° ± 4° 



1450° ± 2° 



Ab 2 An l 



1205° ± 5° 



1394° ± 2° 



Ab 3 An x 



1175° ± 8° 



1362° ± 2° 



Ab.,.,An 00>[k 



1158° ± 5° 





77 5 22 5 



Ab 4 An a 





1334° ± 2° 



Ab 8 An 1 





1265° ± 3° 



Ab An. 



1100° + 10° 





*Penfield and Sperry, this Journal (3), xxxvi, p. 324, 1888. 



