'ilS Geology ■, '^-c of the Connecticut > 



This appears to be a real chalcedony x -^ and such specimens 

 are not uncommon. 



No. 6. Fortification and Eyed Agates, in the same speci- 

 men. One of the latter is an inch in diameter, and has six 

 or seven zones of lighter and darker chalcedony and one of 

 carnelian, enveloping a nucleus of light ijlue chalcedony. 



These specimens seem to want nothing but a polish to 

 make them equal to any in the splendid cabinet in New- 

 Haven. The rock in which they occur i« not strictly arayg- 

 daloidal, but contains only a few large cavities; and so firm- 

 ly are the agates fastened into their bed that one is often 

 obliged to break them out by piecemeal ; thus ruining the 

 most superb specimens. The larger ones are not very abun- 

 dant. The rock, however, has not been penetrated very 

 far. 



20. Siliceous Sinter. At East-Haddam, in gneiss and in- 

 crusting mica slate. (T. D. Farter and Webster.) 



21. Opal. "Common opal has been found in Litchfield, 

 though rarely.'' {Brace.) 



22. Flint. Near New-Haven and in Woodbridge, in roll- 

 ed masses. (Silliman.) 



23. Hornstone. At Litchfield, (ilrace.) At the Southamp-' 

 ton lead mine ; also in Conway. Also in greenstone at 

 Southington and Deerfield. At the latter place it occurs in 

 nodules oft>n four or five inches in diameter. Its colors are 

 grey, green, black with a tinge of red, and dark blue. Its 

 fracture is sometimes a little chonchoidal and glistening, 

 sometimes dull and splintery; and it is scarcely translucent 

 at the edges. Some specimens considerably resemble sili- 

 ceous slate, and others appear like prase. But Professors 

 Silliman and Dewey (the latter of whom has examined it 

 chemically,) agree in calling it hornstone. Also in Sunder- 

 land in greenstone, in narrow veins — well characterised. 



24. Jasper. Near New-Haven in rolled masses. (Gil)bs.) 

 Also at Cummington on the banks of We^ifield river. (/. 

 Porter.) Also on the banks of Deerfield river in Deerfield., 



