220 Geology, ^-c- of the Connccticul. 



29. ChrysoherijI. At Haddam, on both sides of the river, 

 ill six-sided prisms and six-sided tables, in granite. (Gibbs.) 



30. Zircon. At Sharon, Litchfield county, in quartz. 

 {Silliman.) Also at Brimfield, in gneiss. (Eaton.) 



31. Siliceous Slate. 



1. Basanite. Sometimes found in alluvial soil on the 

 banks of DeerfteJd river ; but perhaps brought thither bj 

 the aborigines, who nnade use of this and of jasper for barbs 

 to their arrows and pikes. 



32. Pitchstone. Near New-Haven. (Silliman.) 



33. Mica. 



1. Lnminated. At Leverett, Alstead, &c. " , 



2. Lamellar. At Woodbury it is violet. (Silliman.) Also 

 at Goshen, Mass. yellowish green and violet, and some- 

 limes in rhombic tables. (Gt6&5.) Of the same colors at 

 Bellows Falls, in granitic veins. (Silliman.) Most of the 

 mica in the granitic veins in Conway, Ashfield, Williams- 

 burgh, Chesteriield, &ic. is straw yellow, sometimes rose- 

 red, and in these veins it exists in excess. It occurs in 

 these and other towns also, in granite of a smoky or nearly 

 black color. 



3. Prismatic Mica. Near Watertown. (S?7//man.) At 

 Litchfield. (Brace.) :' 



34. Shorl. 



1. Common Shorl. At Haddam, in six-sided prisms, ter- 

 minated by three-sided pyramids. (Gibbs and Webster.) It 

 occurs in almost every town in the primitive region along 

 the Connecticut. Localities where it is found abundant, 

 or beautiful, are Pelham, Shutesbury, Orange and Brattle- 

 borough. At the latter place it is found abundantly near 

 the centre of the town in mica slate or hornblende slate : 

 and also near the north line of the town (mentioned in 

 Cleaveland's Mineralogy as occurring in I>ummerston,) it 



