330 Prof. Gmelin’s Analyses. , 
‘<'T his mica has a beautiful rose red colour, and occurs near 
Penig, in Saxony, together with amblygonite, topaz, albite, 
sehorl, &e, 
“‘ Most of the minerals that occur in this place contain 
lithion ; as for instance, a fine variety of quartz, lithomarge, 
andalusite, &c. Ishall publish the analyses of all these 
minerals in the Edinburgh Philosophical Journal, a it will 
give me much pleasure to send you specimens of eac 
“While on this subject, allow me to say that I have uae 
ered a very useful test for lithion, before the blowpipe : viz. 
the flame assumes a very fine purple colour—but the flame 
of an oil lamp should be used, and not that o: a tallow can~ 
dle. By means of the latter the colour of the flame is not so 
decided. 
‘‘ By an analysis of Helvin, a very a mineral, I have 
discovered glucine to ae a Seu o It consists of 
ca, 3.958 
Glucine, = - - - 12.089 
Oxydule of manganese, : 31.817 
Protoxide of iron - 5.564 
Sulphuret of uatigatiess, - 14.000 | 
96.728 
Loss by ignition, 1.555 
“ The Latrolite of Mr. Brooke (Diploite of Bresthaupt) is 
perenctes, neers to my aUa TECH, 8, 0 
ca, 44.653 
=a - - - - 36.814 
Lim - - 8.291 
Ox. of manganese, 3.160 
Manganese _— OX. oti manganese, 0.628 
Potash. 6.575 
100.000 
Gain, E81 
