Classes of Rocks. 149 



alternates with the slaty subdivision (gneiss.) It is the same 

 at Chesterfield, Goshen, Southampton, Russel, Spenser, &c. 

 in Massachusetts. Also in Haddam, Litchfield, Norfolk, 

 &c. in Connecticut. These and numerous other localities 

 seem to authorize the adoption of the opinion of De Witt 

 Clinton, L. L. D. Professor Nuttall, and several Europeans, 

 who prefer including the granite and gneiss of Werner under 

 the general name granite. Varieties. Sandy, at Little Falls. 

 Porphyritic, in Johnstown, Montgomery county, N. Y., Litch- 

 field, Connecticut, Chester, Massachusetts. Graphic, in 

 Litchfield, Connecticut, Southampton mines. Contents. 

 Steatite, in Savoy. Diallage and plumbago, Lake George. 

 Magnetic iron ore, Crown Point, lake Champlain. Schorl, 

 every where. 



2. Mica Slate. 



Varieties. Compact, on the Boston stage road between 

 Worthington and Chesterfield, and between Shrewsbury 

 and Northborough, Massachusetts. Fissile, Fort Montgom- 

 ery in the Highlands, Conway, Massachusetts. Contents, 

 Staurotide, Litchfield and Goshen, Connecticut. Sappare y 

 Chesterfield, Massachusetts, Chatham, Connecticut. Garnet, 

 every where. 



3. Hornblende Rock. 



Divisions. Slate, east part of Becket, Mass., Butterhill, in 

 the Highlands. Granitic, Dalton, Mass., Highlands, adjoin- 

 ing the granite. Varieties. Gneisseoid, Dalton, Mass., But- 

 terhill, Highlands. Porphyritic, Conway, Plainfield, Buck- 

 land, Mass. Sienitic, Chip Hill, Johnstown, N. Y. and near 

 Boston, Mass. Contents. Granite, in veins, Belchertown, 

 Mass. Actynolite, Cummington, Mass. Augite, Lake 

 George, N.Y. 



4. Talcose Slate. 



It is always slaty. Divisions. Compact, east side of Sad- 

 dle Mountain Range. Fissile, on the west side of the same 

 range. Variety. It is highly colored with chlorite in the 

 east part of Savoy. Contents. Chlorite, in beds in Savoy 

 and Florida, Mass. Octahedral crystals of iron ore, near 

 Williams College, Mass. 



5. Granular Quartz. 

 Divisions. Compact, adjoining the east side of Saddle 

 Mountain Range. Sandy, on the west side adjoining the 



