Limestone Onyx from Big Bug Mining District, Bradshaw Mountains (Bradshaw Range), Yavapai County, Arizona, USA
USA | |
| Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 125. |
| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 153 Univ. of AZ Bull. 41 (1916-17), Mineralogy of Useful Minerals in AZ: 47. |
| Tenney, J.B. (1928), The Mineral Industries of AZ, AZ Bur. of Mines Bull. 125: 107. |
MRDS database Dep. ID #10110116, MRDS ID #TC35439. |