and. the Products of its Transmutation. 125 
evidence that they were products of the transmutation of 
Wernerite—the crystal form of that mineral. 
Since only a few of the minerals examined were decom- 
posed by hydrochloric acid, and as the estimation of both 
alkalies and silica was necessary, each analysis was double ; 
the one by fusion with carbonate of soda, giving the per- 
centage of silica, alumina with peroxide of iron, lime, and 
magnesia; the other by hydrofluoric acid, giving the per-: 
centage of potash and soda, together with that of alumina, 
peroxide of iron, lime, and magnesia. The results of the 
analysis by the former method are marked I., and of those 
by the latter II. ; the mean results are marked III. 
- J. MuronitE (CaO), SiO, + 2 (Al, O, Si O,). 
The analysis of this mineral was undertaken first, because 
in the examination of Wernerite it appears to be the most 
appropriate starting point. Its physical characters admit of 
a positive inference that it is an unaltered mineral. | 
The crystals analysed occur, accompanied by green augite, 
and more rarely anorthite, in druses of granular limestone 
at Monte Somma. -Their separation from anorthite is very 
tedious, and the discrepancies between the previous analysis 
of meionite are very probably owing to an admixture of that 
mineral. The density was 2°734 and 2°757. Hydrochloric 
acid decomposed the powdered mineral completely, but con- 
trary to previous observations, the silica separated as a 
powder, not in a gelatinous state. Analysis gave :— 
Oxygen Ratio. 
7 Pe Ee 
Silica, . ; 49°55 99°11 3-00 
Alumina, ? ‘ 30°89 14°44 
Peroxide of iron, . 0:41 ae 14°56 1-98 
Lime, : : 91:4] 6-09 
Magnesia, . 0-83 0-33 ; 
Potash, . : : 0-93 0:16 6:90 0:94 
- Volatilizable substance, 0°19 
- This analysis gives an oxygen ratio which approximates 
so closely to-1:2:3, the one corresponding to the above 
