CusACK — On the Melting Points of Minerals. 



413 







OXIDE?. 





Zircon, 



. infus. 





Broolite, 



. 1560° 



Cuprite, 



. 1162°. 





Uraninite, . 



. 1188° 



^incite, 



. 1260°. 





Corunduf/i, 



. infus. 



Ca-ssitirite, . 



. 1127°. 





Quartz, 



. 1425° 



Rutile, 



. 1560°, 





>> 



softens, 1406° 



PHOSPHATES. 



Vivianite, . 

 Wavellite infus 



1114= 



CorTi. 



Apatite — 



A. 1221°, S^tzerland. 



B. 1227", Eengrew, Canada. 





SriPHIDES. 





Moli/hdeyitte, 



. 1185°. 



Galena, 



. 727°. 



Realgar,"^ . 



. 377° (•?). 



Zincblende, 



. 1049°. 



Orpiment,^ . 



. 325° (?). 



Iron Pyrites 



. 642° (?).t 



St Unite— 





Marcasite, . 



. 642° (?).t 



A. 518°. 









B. 523°. 









* If Eealgar or Orpiment are suddenly raised to the above tempei-atuies they 



appear to melt before subliming. 

 t Oxidizes suddenly. 



