| Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 337, 342 Wilson, E.D. & G.M. Butler (1930), Manganese ore deposits in AZ, AZ Bur. Mines Bull. 127: 36-38. Palache, C. & E.V. Shannon (1920), Higginsite, a new mineral of the olivenite group, Am.Min.: 5: 155-157 |
Twilight Mine, Higgins Mine, Bisbee, Cochise County, Arizona, USA