66 XEW YORK STATE MUSEUM 



garnets are of the red almandite variety up to 5 inches in diameter 

 and without hornblende rims, while at the second-named localit}- 

 similar garnets up to 6 or 7 inches in diameter are enveloped in 

 black hornblende, these latter, therefore, presenting an appearance 

 very similar to those long known from the mine on Gore mountain 

 in Warren county near Xorth Creek. It is this Grenville, horn- 

 blende gneiss which is most likely to yield large garnets, but lack of 

 transportation facihties and the general condition of the garnet 

 market have thus far prevented any real mining within the quad- 

 rangle. A number of years ago some garnet was shipped from an 

 excellent deposit, similar to those above described, about 212 miles 

 northeast of Indian Lake village (one-half of a mile east of Bull- 

 head pond I on the adjoining Xewcomb sheer. Garnets are crushed 

 and used for abrasive purposes. 



Feldspar 

 For some years those engaged in pottery and chinaware industries 

 have been seeking suitable deposits of feldspar. While feldspar is 

 the most common mineral within the quadrangle, it is not commer- 

 cially valuable unless occurring as the white potash (orthoclase) 

 variety in large masses, usually in pegmatite dikes or veins. There 

 are many pegmatite dikes ranging from a few inches to a hundred 

 feet wide within the quadrangle, but none promising to be of com- 

 mercial value could be located. Some of the largest observed de- 

 posits are located as follows : i mile a little east of north of Indian 

 Lake ^-illage where there is a dike or vein about 15 feet wide and 40 

 or 50 feet long; just southeast of the small gabbro stock on the 

 largest island in Blue ^lountain lake and in contact with the gabbro 

 on the west, this dike being fully 100 feet wide and 200 yards long ; 

 and a dike 10 or 15 feet wide cutting Grenville hornblende gneiss on 

 Cedar river y'l miles west of Indian Lake village. 



