MINERAL RESOURCES OF THE STATE OF NEW YORK 73 



equal proportions. Quartz is very subordinate and practically 

 absent over considerable areas. There is little of graphic inter- 

 growth. Of the iron-bearing silicates, biotite and black tourmaline 

 are fairly common, but they are mostly localized in bunches and 

 bands. The present quarry face is 75 feet wide and 50 feet high; 

 it would appear that the body is a lens or stock having a north- 

 easterly trend, but the outlines are not well-defined and the con- 

 tinuity of the pegmatite to northeast is uncertain as a grayish 

 gneiss intervenes on the line of strike at no great distance from the 

 face. There is however a large supply of material still obtainable. 

 The main drawback to operations appear to be the remote situation 

 which entails a long haul over a rugged country. The occurrence 

 is on the property of H. W. Willcox of Crown Point. 



Pegmatite apparently in a large mass outcrops on the road leading 

 west from the south end of Peniield pond about due south of the 

 preceding locality. It was noted by the writer several years ago 

 but was not examined with reference to the quality of the materials. 

 There are many occurrences in this section, notably in vicinity of 

 Crane pond. 



Ticonderoga. About 2 miles west of Ticonderoga at the eastern 

 border of the Adirondack Precambrian area is a large pegmatite 

 deposit that has been quarried extensively by the Barrett Manu- 

 facturing Co., principally for roofing material. The occurrence is 

 similar to that at Crown Point, consisting of a lens of pegmatite 

 with a longer axis running northeast, in Grenville gneisses, and 

 the feldspar and quartz rather evenly distributed so as to be separable 

 only with difficulty. The individual crystals measure 6 to 8 inches 

 as a maximum. The principal dark mineral is biotite. Accessory 

 tourmaline, garnet and iron sulphides are present. A mill equipped 

 with crushers, rolls and screens is located at the quarry. The 

 property has been idle during the last 2 or 3 years. 



Fort Ann. A pegmatite body 2I miles northwest of this place 

 has yielded both pottery spar and quartz. A small mill for grinding 

 quartz was operated at Fort Ann some 30 years ago, and the material 

 was quarried at different places in the vicinity and near Whitehall 

 and Port Henry. The pegmatite quarry was last worked by Domi- 

 nick Ashley, a few years since. It is a lens about 75 feet wide in 

 the middle and two or three times as long, outcropping at the base 

 of a gneiss ridge of which the sttmmit part is known as Putnam 

 mountain. The wall rock is a biotite variety of gneiss that may 

 be classed as Grenville. The quartz and feldspar masses reach 

 good size — 2 or 3 feet across — but there is considerable graphic 



