_ and Geology. 421 
.. having been sepéaindty melted dee yeti a at a’ 
the cavity into a position where it became transparent, I found t 
| fluid whatever in the®cavity ; so that we have nos an 
| example of a crystal melting and reerysiallizing — having been 
dissolved in one of the fluids. From the irregular state of the lamine 
close io this cavity, there is e oe “pean of cd fluids having 
escaped from one of its extremitie 
In several instances a crystal jvas seen to have a rapid rotation 
through some cause beyond explanation. Speaking of :one cavity, it is 
Ye pes 
a third amorphous; and a fourth and fifth, two irregular halves of a 
hexagon. Upon the first application of heat, one or two of these crys- 
tals peept from —_ resting place, and darted to the opposite side of 
In nds the others quitted their places one after 
. Kraurite and rain in Tennessee; by G. Troost.—These 
minerals occur near Brush Creek, which runs into the French Broad 
Che 
River in Cocke co unty, Tennessee. raurite occurs in botryoidal 
concretions fe cavities, or in small masses imbedded, or in small 
veins, in a manganiferous brown iron stone (hycranpd of “ro, inter- 
Color ; in its transverse fracture, the green color ep, ex- 
hibiting zones of different shades of green, p white 
or eeriah yellow of several shades from brownish to brig yew. 
" ts structure is fibro-radiating ; this fibrous structure, in proportio 
:* it deviates from the centre, assumes an asbestiform appearance ; ‘this is 
i rally the case with the yellow variety, and it resembles then the 
oxene, not only in appearance, but also before the blowpipe. In 
tion as the alumina or iron prevails. A delicate — variety of a yel- 
low color, forms also small veins through the ma 
It is associated with Wavelite, (?) — nevertheless is only disper- 
sed in a few small particles through the in 
fect the es: two minerals seem to pass t the one into the other, in propor... +2 
