176 Intelligence and Miscellanies. 



have been adopted. There is no description of them in 

 ])rint, and I cannot personally furnish you with answers to 

 your enquiries at this time. In the course of a few weeks, 

 I hope to be able to do it satisfactorily. Your friend and 

 servant, GEO. VAUX. 



B, Sillitnan, Esq. 



3. American Andalusite. 

 To the Editor. 



New- York, Nov. 25, 1822. 

 Dear Sir, 



I am much pleased to have it in my power to announce 

 an American locality for well characterized Andalusite. I 

 lately discovered in Litchfield, Connecticut, a group of ir- 

 regularly aggregated crystals, the interstices being filled 

 with granular quartz. 



They 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- 

 tion. It is more perfect and beautiful, however, than any 

 that I have seen. The largest crystal is in its diameter 1^ 

 inches by 1 {. 



It appears to have come from granite, but there are no 

 decisive indications of this particular. 



Very respectfully, your obedient servant, 



J. DELAFIELD. 

 To Professor Silliman. 



