250 



NEW YORK STATE MUSEUM 



Production of stoae' aceording to use- in 191 8 



KIND 



BUILD- 

 ING 



STONE 



MONU- 

 MENTAL 



CURBING 

 AND 

 FLAG- 

 GING 



CRUSHED 

 STONE 



ALL OTHER 



TOTAL 

 VALUE 



Granite 



Limest^ ne 



^15 016 



$8 311 





$60 260 

 2 621 527 



a 



2 286 

 621 750 



$107 964 

 2 210 821 



39 718 

 105 059 



I19I 551 



4 832 348 



135 756 

 325 351 

 621 750 



MarUo 



Sandstone 



Trap 



52 085 

 60 942 



43 953 



$157 064 











Total 



$128 043 



$52 264 



$157 064 



$3 305 823 



$2 463 562 



$6 106 756 



a Included under " all other.' 



GPsANITE 



Granite is both a specific and a general term. When used in 

 the restricted scientific sense it means an igneous rock of thoroughly- 

 crystalline character in which the chief constituents are feldspar, 

 quartz and mica. Such a rock has a massive appearance; that is, 

 the constituents are uniformly distributed in every direction, and 

 owing to the predominance of the feldspar and quartz the color is 

 rather light, commonly gray or pink. As a variation to the uniform 

 distribution of the minerals, the latter may develop a plane parallel 

 arrangement through the influence of compression when the mass 

 was still deeply buried in the earth's crust. A granite with this 

 parallel or foliated texture is known as a granite gneiss. 



The commercial definition of granite is much broader than that 

 given and includes almost any of the crystalline silicate rocks 

 (usually igneous) that possess the requisite physical qualities for 

 use as architectural or monumental stone. In most cases the 

 commercial product is actually a granite in the true sense, but not 

 infrequently it may be a syenite which lacks quartz, or a diorite 

 consisting of plagioclase feldspar and hornblende, or anorthosite 

 which contains little else than basic plagioclase feldspar. So-called 

 black granites are mainly gabbros and diabases with a large propor- 

 tion of the iron compounds pyroxene, hornblende and magnetite. 



The broader usage will be followed in the present classification, 

 as all the above-named rocks are quarried in this State, 



The only silicate rock not included under granite is diabase or 

 trap which by reason of the special features surrounding its pro- 

 duction and uses is classed by itself. 



