Topaz. 357 
alkali, (which siain could not be removed without washing 
and thoroughly heating the foil,) not as deep however, in the 
case of the mineral under consideration, as with the spodu- 
mene. But the trial we made was not a “ih as we 
have not bad leisure to pursue it farther, we merely make the 
suggestion that this mineral may contain lithia ; ane if so, it 
will account for the remarkable change from blue to 
which its powder produces upon vegetable infusions. The 
following are the collected results of the above — 
— Pitty oe contain 
ter. 2 1.45 
seen hot. 19.9 r. 4(DNo.I-=6.3 5h ae 
A(C. Nox Ill. =0.9 g saien No: Iisa a asin 
Silex (D. Nowil=3.4 g)4(D iho. Ab: =11.47 gts.) 14.87 
Fluoric Acid (B. II.) 4.56 
fron ? Lithia ? mere as ae Rae. 5.39) 
“After this examination 1 we cannot hesitate to pronounce 
this mineral to be the topaz ; agreeably to your opinion ex- 
pressed upon first inspecting it. If this opinion be correct, it 
adds another interesting mineral to the list of American lo- 
calities, since, as we believe, no certain locality of the topaz 
kas been announced in this country. The enormous size of 
some of the crystals hitherto found does indeed detract from 
their delicacy and beauty, so that in these respects they will 
not compare with the topazes of the eastern continent. 
we doubt not, finer crystals will ere long be disclosed. At 
any rate, it - seiees a very curious Bich vs several of the 
minerals pe, should oc on < 
