176 Intelligence and Miscellanies. 
have been adopted. There is no description of them in 
print, and I cannot personally furnish you with answers to 
our enquiries at this time. In the course of a few weeks, 
Teces to be able to do it satisfactorily. Your friend and 
servant, GEO. VA 
B. Silliman, Esq. 
3. American Andalusite. 
To the Editor, ; 
5; New-York, Noy. 25, 1822. 
Dear Sir, 
I am much pleased to have it in my power to announce 
an American locality for well characterized ndalusite. 1 
lately discovered in Litchfield, Connecticut, a group of ir- 
regularly aggrégated crystals, the interstices being filled 
with granular quartz. 
‘hey are principally four sided prisms, nearly rectangu- 
lar, varying in form to the rhombic. One of the prisms 
(being very perfect) has an acumination of two of the sol- 
id angles on the opposite ends of one of the diagonals of 
that termination of the prism which is in view. This 
acumination is formed by three converging planes of trun- 
tion, two of which cut obliquely the two lateral planes, 
and the other the terminal one. 
The solid angles are thus replaced by three faces. 
There are no lateral truncations. The structure is folia- 
ted; the laminae of strong lustre; the color is bluish gray: 
The crystals translucent at the edges. Spec. grav. 32. 
The Litchfield andalusite is so very analogous to foreign 
Specimens In our cabinets, that it needs no further descrip- 
_ _ is more — and beautiful, however, than aay 
ha: ve seen. The largest crystal is in its diameter ! 
a — rgest crystal is in its diameter 1; 
It appears to have come from granite, but there are né 
decisive indications of this Say beg 
Very respectfully, your obedient servant, 
J. DELAFIELD. 
To Professor Silliman, 
