258 NEW YORK STATE MUSEUM 



buted through the mass. The gneiss has the appearance of a meta- 

 morphosed igneous rock allied to the syenitic class which is so 

 abundant in the eastern and northern Adirondacks. The garnet 

 crystals range from a fraction of an inch up to 4 or 5 inches in 

 diameter. It is only occasionally that they possess crystal bound- 

 aries and then show dodecahedral development with a parting 

 parallel to the crystal faces. They are of dark red color, trans- 

 lucent on thin edges. The garnet is extracted by mechanical 'means, 

 the rock being crushed and passed through jigs of special design 

 which effect a good separation although there is only half of a 

 unit difference in the gravity of the garnet and the hornblende. 

 The product has a bright, fresh appearance of typical garnet color. 

 It is shipped unsorted, the sizing being done by the manufacturers. 



The Rogers quarry on Gore mountain in the same vicinity has 

 been operated for many years by H. H. Barton & Son Co. and is the 

 oldest of the Adirondack workings. It is based on a long, narrow 

 band of hornblende schist or amphibolite, which may represent 

 either an altered dike of gabbro or an inclusion of Grenville gneiss 

 in the country syenite. The garnet occurs in roundish masses and 

 aggregates which are probably crystal individuals, though not regu- 

 larly bounded. It shows the effects of deformation and crushing, 

 so much so that the masses shell or break down readily when they 

 are exposed, yielding small fragments which are bounded by one or 

 more smooth surfaces that represent the dodecahedral parting, 

 characteristic of the crystal garnet. The individual crystals attain 

 very large sizes, some of them yielding many hundred pounds of 

 broken garnet. The extraction of the garnet is by cobbing and 

 hand picking. 



The Wevertown quarry of the Warren County Garnet Mills 

 turns out a product that is rather different from the others, the 

 garnet being less distinctly of crystalline habit and of lighter color. 

 It is associated with pyroxene, the two minerals constituting the 

 rock which is undoubtedly a metamorphosed limestone. In some 

 parts of the workings the garnet occurs in nearly solid masses. A 

 very similar occurrence was worked for a time near Keeseville. 

 The product when crushed is of granular rather than platy char- 

 acter. 



The total shipments from the Adirondacks last year amounted to 

 5840 short tons with a value of $198,200. The figures are not 

 strictly comparable with the statistics of previous years, which 

 represented production and not sales. The output in 191 5 was 

 reported as 3900 short tons valued at $134,064. 



