344 



f = 78 28'. 



2. According to KLAPROTH, the present species consists of 



Silica 50-50. 



Lime 17'00. 



Alumina 16-00. 



Oxide of Iron 9-50. 



Oxide of Manganese 5-25. 



Potash 0-25. 



Before the blowpipe it melts easily, and with intumescence, 

 into a dark-green glass, which becomes black in the oxi- 

 dating flame. Some varieties are differently electrified by 

 heat, contiguous to opposite ends of the crystals, and in 

 these also a difference in the form has been observed by 

 HAUY. 



3. Prismatic Axinite occurs in beds and veins in primi- 

 tive countries. It is accompanied in the former by rhom- 

 bohedral Lime-haloide, dodecahedral Garnet-blende, &c.; 

 in the latter chiefly by several species of Augite-spar, 

 Asbestus, rhombohedral Quartz, &c. also by various me- 

 tallic minerals. Several of these veins belong to the class 

 of those supposed to be of cotemporaneous origin with the 

 rocks which they traverse. 



4. It is found in beds at Thum near Ehrenfriedersdorf, 

 in Saxony, from whence it derived its first name of Thumite 

 or Thumerstone. At Kongsberg in Norway, it occurs in veins 



* Mr PHILLIPS gives these measurements as follows : u on 

 P = 135 10'; u on r = 115 17'; P on r = 134 40'. H. 



