01/09/2007

Gem-quality Johachidolite

Authors: Adolf Peretti, Detlef Günther, Eric Reusser, Thomas Armbruster, Francesca Peretti, Willy Bieri, Ngwe Lin Tun, Kathrin Hametner, Milen Kadyiski Published in: Contributions to Gemmology No. 5 Download Publication

Various
01/11/2003

Pezzottaite from Ambatovita, Madagascar: A new gem mineral

Authors: Adolf Peretti, Brendan M. Laurs, William B. (Skip) Simmons, George R. Rossman, Elizabeth P. Quinn, Shane F. McClure, Thomas Armbruster, Frank C. Hawthorne, Alexander U. Falster, Detlef Günther, Mark A. Cooper, and Bernard Grobéty Published in: Gems & Gemology Download Publication

Various