MINERAL CONSTITUENTS OP METEORITES. 
209 
forms of enstatite proved to be acted upon ; and the results in each case showed that 
the acid exercises simply a solvent action upon the mineral without separating it into 
two or more distinct silicates. 
The subjoined Table records these experiments. The different degrees in which the 
acid dissolved the minerals in either case was due to the more or less complete character 
of the trituration to which the minerals had been subjected. 
I deemed it desirable in one case (and I selected the transparent variety for this 
purpose) to repeat the process three times so as to remove any doubt as to the nature 
of the action exercised by the acid. 
Of the greyish-white variety, T0686 grm. was submitted to the action of acid for twenty 
hours at 100°, and subsequently to that of potash, to remove separated silica, for twelve 
hours. It yielded 
Mineral dissolved =0 TOO 6 grm., viz. 
per cent. 
jin acid, 0*0475 = 4*445 1 
tin potash, 0*0531 =4*969 J 
per cent. 
9414 
Mineral unacted on =0*968 = 90-586 
100-000 
The analysis of the 9-414 per cent, dissolved is given in column I. of the Table. 
Of the grey tabular variety of enstatite 0-1478 grm. were treated by hydrogen chloride 
for sixteen hours at 100°, and subsequently by potash for a similar time. 
The dissolved portion was 0-0115, viz. 
The residue unacted on was 0-1363 
per cent. per cent. 
Jbyacid, 0-0047=3779] 
[by potash, 0-0068=4-6 J 
=92*19 
The 7 "7 7 9 per cent, dissolved gave on analysis numbers the approximate composition 
of which is given in column II. 
Of the white variety of the enstatite 0-2082 grm. yielded on a first treatment for 
twenty hours with acid, and subsequently with potash, 
Dissolved mineral= 0-0264, viz. 
per cent. 
jby acid, 0*0164 = 7*877 1 
{by potash, 0-01 = 4*803 j 
per cent. 
= 12-68 
and undissolved=07818 
= 87-319 
The approximate composition of the 12-68 of dissolved mineral is given in column III. 
On a second treatment of the undissolved portion, whereof after two hours further 
trituration 0-1674 grm. were operated on as before with acid for thirty, and with potash 
for twelve hours, 
The mineral dissolved=07137, viz. 
Mineral unacted on=0*0539 . . 
per cent. 
jby acid, 0-0437=41-7661 
{by potash, 0-07 = 26-074 J 
67-84 
32-16 
