38 C. U. Shepard on Lazulite, etc., in Georgia. 
eenish, massive kyanite, with scales of white mica (often 
rtiall decomposed so as to resemble talc), ne 7 
in little bunches, in the — of the lazulite cryst A 
these, the naked e ye often detects minute and nearly trangpe ' 
red crystals of tile Those of a still smaller size, and visi 
only with the aid of a lens, are pretty widely diffused thro | 
the rock, and often coat the rough surfaces and joints of the Jaze : 
lite Mel ee themselves. ; 
drusy cavities very rarely occur in the itaco — 
prntty teas filled with barytes, massive and crystalline. Very _ 
minute and panies, formed transparent crystals of quartz are 
discernible in Pog a likewise microscopic crystals of sul | 
phur rm of the barytes is that represented in fig. 510 
of Dana, coming fiom the gold formation (itacolumite ?) of Fau- 
quier county, 
The crystals Pe re coeyee by the following eve obi 
gingly furnished by Prof. Dana; and are lettered i ord: | 
ance with the figure of a lazulite erystal on p. 404 of "his in 
eralogy. The rarest of these forms is figure 1, of which I nae : 
Ay 
Si above one-third of 2 inch in length. 
Figs. 3 and 4 are unsymmetrical modifications 
of fi fig. 1, in which the ight hand planes 2 
and —2 are pean gp pea! prolonged, and in fig. 
are possessed of very unequal dimensions, 
giving rise to a very flattened crystal. othe AOS of 
Bare are the largest found, sometimes measuring above one in 
hy : 
