Prosopite, an Effective Turquoise Substitute Prosopite, an Effective Turquoise Substitutev. 15205–208Dunn, Pete J. 1976. "Prosopite, an Effective Turquoise Substitute." Journal of Gemmology, 15 205–208.More...ID: 97125Type: articleKeywords: NMNH; NH-Mineral Sciences; Annals-Import