‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 152; Bowles, O. (1940), Onyx marble & travertine, US Bur. of Mines Inf. Circ. 6751R; Tenney, J.B. (1928), The Mineral Industries of Arizona, AZ Bur. of Mines Bull. 125: 107.
Onyx quarries located on Camp Creek, West of Cave Creek, about 52 miles North of Phoenix.