THE MIXING AND QUARRY INDUSTRY IQO/ 6l 



Granite 



Under the head of granite are grouped by the trade the crystal- 

 line rocks in which feldspar and other silicates are the predom- 

 inant minerals. Besides granite in the strict sense the class com- 

 prises syenite, diorite, gabbro and anorthosite, in fact practically 

 all of the igneous rocks, as well as many gneisses and schists, 

 that are adapted for building construction or ornamental pur- 

 poses. The fine grained crystalline rocks known as trap, how- 

 ever, are usually separated from the class owing to their some- 

 what special qualities and will be treated here under their own 

 title. 



There are two principal areas where these rocks occur in Xew 

 York, the one being the Adirondack region and the other the 

 lower Hudson valley and the bordering highlands. Both regions 

 afford a variety of both massive and gneissoid types in great 

 abundance, yet the quarries have not been developed as yet on 

 a scale at all commensurate with the local markets. The present 

 output represents but a fraction of the granite actually used each 

 year for building or other purposes ; by far the greater part is 

 brought in from other states and some is imported from foreign 

 countries. 



The returns received from the quarries for 1907 show an output 

 valued at $195,900, as compared with a value of $255,189 for the 

 preceding year. The value of the building stone quarried was 

 $84,774 against $231,190 in 1906, the decrease being due to the 

 smaller operations in the quarries of Westchester county which 

 supply building stone to New York city. The production of 

 granite for other purposes was as follows: monumental stone, 

 $9613, against $4119 in 1906; crushed stone, $92,950 against 

 $13,980; rubble and riprap, $5600 against $2423; paving blocks, 

 curbing and miscellaneous, $2963, against $3477. Tlie quantity 

 of crushed stone made was approximately 111,150 cubic yards 

 against 16,800 cubic yards in 1906. Westchester county contrib- 

 uted a ]jro(luction valued at $76,820, as compared with $172,845 

 in the preceding year. The remainder of the production was dis- 

 tributed among the following counties: Clinton, Essex, Fulton, 

 Herkimer, Jefferson, New York and Warren counties. There 

 were 14 (juarries operated during the year, or fl\e loss t1ian in 

 1906. 



