•212 Analysis of Aslestous Actinolite. [Sept. 



acid, and threw down the copper by a plate of zinc. It weighed 

 05 grain. 



1 1. The constituents thus obtained not amounting to the weight 

 of the mineral analysed, it remained to examine whether it con- 

 tained an alkali. For this purpose it was fused with five times its 

 weight of nitrate of barytes. It was then dissolved in muriatic 

 acid, and filtered, to separate the silica which remained undissolved. 

 The muriatic solution was mixed with sulphuric acid, and filtered, 

 to get rid of the barytes. The liquid was then supersaturated with 

 carbonate of ammonia, to get rid of all the earthy and metallic 

 substances which it held in solution, and the liquid passed through 

 a filter. This liquid was evaporated to dryness, and the dry salt 

 exposed to a red heat in a platinum crucible. There remained 4*3 

 grains of a substance, which proved on examination to be sulphate 

 of soda. Now the soda contained in 4'3 grains of sulphate of soda 

 is 1*90 grain. 



From the preceding analysis it appears that the constituents of 

 the mineral aie as follows: — 



Silica 16-700 33*4 



Alumina 14100 2S*2 



Lime 0*523 1 -046 



Magnesia 0*300 0*6 



Oxideofiron 8*575 17*15 



manganese 3*600 7'2 



Tungstic acid 1*920 3*84 



Copper 0*500 1 *00 



Soda 1*900 3*8 



Moisture 0*850 1*7 



Loss <,;.... 1032 2*064 



50*000 100*000 



The great number of constituents in this mineral is remarkable. 

 As the mineral came from a copper-mine, I consider the copper as 

 in all probability proceeding from some unnoticed speck of copper 

 ore j but it was found in the same proportion nearly in three diffe- 

 rent trials. I suspect the manganese not to have been free from 

 iron. I had undertaken an analysis on purpose to detertnine that 

 point more correctly ; but an accident destroyed the vessel and its 

 contents before it was in my power to determine the point. From 

 the great number of constituents, one would suspect the presence 

 of various minerals ; but nothing appears to the eye except the 

 yellow specks and the crystals. 



