Intelligence and Miscellanies. 197 
after which they weighed 11.62 grs. The mixture was now 
digested with muriatic acid until the oxide of iron was whol- 
ly dissolved ; the silica remained behind in white flocks, and 
was separated by the double filter, washed, dried and ig- 
nited. Its weight was 7.53 grs. This amount, deducted 
it probably exists in the mineral, mony 3.68 grs 
The Pee ne of this mineral therefore appeared to be, 
in this instance 
aaa F ; f : % : 1.53: 
Magnesi i é : : 5.50, 
Protoxide of i iron, j : 3.68. 
Oxide of chrome, é : . 1.09, 
Sulphur and loss, emma 
17.80. 
Or per hundred, 
Silex, 42.30. containing oxigen, 21.27. 
Magnesia, 31.46. : : : 12.17 
Protoxide of iron, 20.67. : ; ; 4.59. 
Soda, 
Oxide of chrome, 5.57. 
Sulphur and loss, 
00, 
Considering the soda and oxide of chrome as accidental, 
the preceding analysis, it will be observed, agrees very w well 
with the supposition that the present variety of chrysolite is 
a compound of one atom praitins: of iron, with three atoms 
silicate of magnesia; and its neidence with the miner- 
alogical formula J: $2 +3 3MS. will be still more striking, if 
we suppose the oxigen of the iron is estimated a little too 
high, in consequence of the probable union of a small por- 
tion of that metal with sulphur, to form the proto-sulphuret 
of iron,—a substance whose mechanical admixture, in aslight 
degree, with this mineral was sufficiently evinced by our first 
experiments. 
T am aware that —! difference in composition between 
the specimens jus mined, and those of the chrysolite 
analyzed by Klapiboth ee Stromeyer* may seem op t 
oe € specimens examined by Klaproth came the formu- 
la of whose composition is f s-}- 4MS. For Siommniers yee d of meteoric 
chrysolite, see Vol. 13, p. 184, this Journal. 
