645 
646. 
Mineralogical Cabinet. 39 
- L. Dauphine. Form like 644. A group of large crystals. 
L. do. do. The crystals more slen- 
der, and partially coated by oxide of iron. 
- L. Mount Blanc. Form like 644, excepting the replace- 
ment of some of the solid angles formed at the meet- 
ing of the prism and pyramid, by triangular planes. 
The crystals also present a flattened appearance, in 
consequence of the undue enlargement of two oppo- 
site planes Of the prism. They contain chlorite, 
from whence arises their green color. 
648. L. Haddam, Connecticut. Large, white, and nearly 
opaque crystals of quartz: form like 644, excepting 
in the pyramids, whose planes are equally produced. 
All the large crystals from this locality resemble each 
other in a want of transparency, and lustre, and in 
having their lateral planes made up of numerous 
smaller crystals. 
649. L. Madagascar. A large single crystal; form like 648; 
650. 
65) 
652 
653 
transparent, with air bubbles or cavities traversing 
the interior ina manner so as to form a resemblance 
to net-work. 
L. Dauphiné. A large crystal, with several smaller ones 
attaohed to it, (and also crystals of carbonate of lime,) 
whose lateral planes have not an uniform width from 
one extremity to the other, but are alternately wider 
at one end, and shorter at the other. One plane of 
the pyramid is produced to such an extent as very 
nearly to extinguish the other five, one of which is 
reduced to a much smaller size than the adjacent 
rhomboidal truncation. The crystals, like 647, con- 
tain chlorite, 
- L. Pomiret, Vermont. A single crystal; with transverse 
striae upon all its planes, both lateral and terminal. 
+ L. Alps. Jn flattened prisms, arising from the unequal 
extension of the lateral planes. 
» L. Alps, Savoy. A regular six-sided prism, terminated at 
one extremity by a regular six-sided pyramid, With 
