Mineral resources of the United States . bee, in the mountains surrounding Globe, and inthe vicinity of Clifton. According to Blake ^ there is a broad centralarea of coarse-grained porphyritic granite, generally gray in color,outcropping in the Santa Rita Mountains at Helvetia; on the east sideof the Huachuca Mountains facing the San Pedro Valley; in thenorthern end of the Santa Catalina Range near Oracle; and extend-ing northward toward the Superstition Mountains and to Salt Rivereast of Florence. Blake states that in the Tombstone area graymedium-grained granodiorite occurs which weathers in
Mineral resources of the United States . bee, in the mountains surrounding Globe, and inthe vicinity of Clifton. According to Blake ^ there is a broad centralarea of coarse-grained porphyritic granite, generally gray in color,outcropping in the Santa Rita Mountains at Helvetia; on the east sideof the Huachuca Mountains facing the San Pedro Valley; in thenorthern end of the Santa Catalina Range near Oracle; and extend-ing northward toward the Superstition Mountains and to Salt Rivereast of Florence. Blake states that in the Tombstone area graymedium-grained granodiorite occurs which weathers in such a way asto leave large globular masses or bowlders of disintegration con-fusedly piled on the surface. Another outcrop on a large scale ofsimilar granodiorite is found in the Dragoon Mountains. Quartzdiorite is available in inexhaustible quantities in the BradshawMountains. I Geol. Atlas, folios 111, 112, 126,129. « Blake, Wm. P., Qeology of Ariaona: Kept. Governor of Arizona to the Secretary of the Interior, for1903, pp. I STONE INDUSTRY. 1339 The granite output of Arizona is not large at present and is confinedchiefly to supplj^ing local demands for monumental work and for anoccasional building. Quarries are situated near Phoenix, MaricopaCounty; Globe, Gua County; and Prescott, Yavapai County. The quarries near Phoenix are about 7 miles south of the varieties of granite are produced here, both gneissoid. Thefiner grained of the two is of a gray color and is noticeably porphy-ritic, with white crystals of orthoclase in contrast to the finer-grainedgray mass of the rock. The coarser-grained variety is of lighter colorand with biotite having a linear arrangement. A local light-graygranite, resembling the latter of these two, has been used in the wallsof the first story of the State Capitol at Phoenix. The quarries near Prescott are 1| to 2 miles northwest of the cityon the north side of the Santa Fe, Prescott & Phoenix Railway tracksand about one-fourth
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