Geology, ^c. of the Connecticut, 219 



and in Conway, Leyden, &c. in rolled fragments, red, -black 

 and yellow. 



25. Corundum. At Litchfield, massive and in six-sided 

 prisms, imbedded in massive sappar. (Braes.) 



26. Ci/anite. At Litchfield, Harwinton, Watertown and 

 near New-Haven. {Silliman.) At the former place a mass 

 of this mineral, associated with talc, sulphuret of iron and 

 corundum, is supposed to weigh one thousand five hundred 

 pounds. (Brace.) Also at Middle-Haddam. (Eaton.) Al- 

 so at Chesterfield, Mass. in hiose masses in mica slate; 

 where its bladed or imperfect prisms are two feet long. 

 (Hunt.) Also at Granville. (Dcwty.) Also at Plainfield. 

 {J. Porter.) Also at Grafton, Vermont, and Charlestown, 

 New-Hampshire. (Hall.) Also at Bellows Falls. (Silli- 

 man.) Also at DeerQeld, in mica slate. (Williams.)- 



27. Staurolide. At Bolton, East-Hartford, Beacon-Hill, 

 Litchfield, Harwinton and Chatham. (Silliman, Brace, Ea- 

 ton and Woodbridge.) Also at Cumraington. (J. Porter) 

 Also at Bellows Falls. (Hall.) The range of mica slate in 

 which this mineral is found in Bolton, Chatham, &c. extends, 

 with little interruption, into New-Hampshire and Vermont, 

 at least as far as Bellows Falls; and its aspect is very simi- 

 lar throughout, and,scarcely a mi!e of the distance is it want- 

 ing in staurotide; or rather, wherever I have crossed it, (in 

 perhaps fifty places,) this mineral occurs ; as in Vernon, 

 where it is in vast quantities, in North-Wilbraham, Ludlow, 

 Situtesbury, Leverett, Northford, Hinsdale, Chesterfield, 

 Putney, Westminst^T, &o. In Chesterfield, New-Hamp- 

 shire, Dr. J, A. Allen found crystals an inch and one fourth 

 in diameter, and two inches and an half loni^;, in the valley 

 south-west of the meeting-houso. A rajii^e of similar mica 

 slate extends through Chesterfield, Mass. into Cummington, 

 Plainfield, Hawley, &:c. and here also staurotide occurs in 

 abundance. In Chesterfield I noticed a mica slate rock, 

 two or three feet thick, containing seven or eight distinct 

 layers of this mineral. 



28. Pinite. At Haddam, in mica slate and granite. (Sil- 

 Hnian and Webster.) Also at Bellows Falls. (Hall.) 



