134 Xew localities of Agate, tfc. 



Art. V. Kew localities of Agate, Chalcedony, Chabasie, 

 Stitbite, Analcime, Titanium, Prehnite, fyc. 



JLIeERFIELD, &c. In the account of the Mineralogy and 

 Geology of Deerfield, by Mr. Hitchcock, in the present 

 Number, it will be seen, that these interesting minerals (with 

 the exception of titanium) exist in the secondary green- 

 stone of that place. We have specimens, (through the kind- 

 ness of Mr. Hitchcock,) and observe that the agate*, chal- 

 cedony, analcime, and prehnite, are imbedded in the trap ; 

 the agates are in some instances very delicate in the dispo- 

 sition of their bands, and need nothing but polishing to make 

 them beautiful ; the same is true of the chalcedony. The 

 chabasie and stilbite occupy cavities, and the chabasie is often 

 distinctly crystalized in a rhomboid, so nearly approaching a 

 cube, in the quantity of its angles, that the mistake is easily 

 committed of supposing them to be cubes ; the crystals are 

 sometimes transparent, and the largest a quarter of an inch in 

 diameter. Titanium is found in Ley den ; it is the red oxide- 

 very well characterized — in reddish brown crystals as large 

 as a conmion goose quill,* and, in some instances, perfectly 

 geniculated. It is rare to see finer specimens. 



East-Haven. It will be observed, that the great ranges of 

 secondary greenstone, which cut Connecticut and Massachu- 

 setts in two, terminate at New-Haven, on the one hand, and 

 some way above Deerfield on the other. By comparing the 

 account of the termination at New-Haven (Bruce's Journal, 

 V. i. p. 139.) with that now published, of the termination at 

 or near Deerfield, it will be seen that the geology and imbed- 

 ded minerals are very similar. At East-Haven, (one of the 

 branches of the greenstone of New-Haven, and within from 

 three to four miles of the latter town,) chalcedony is often 

 found, sometimes imbedded in the trap, (but perhaps more 

 frequently loose among the fallen stones,) which, although in 



* Since the -above article was written we hare received some as large as a. 

 finger. 



