Purple Tourmaline from Zambia
- September 1, 2020
- Brendan M. Laurs; Alexander U. Falster; William B. "Skip" Simmons
- The Journal of Gemmology
Tourmaline (dravite) from the Simanjiro District, Tanzania
- June 1, 2017
- Cara Williams; John Bear Williams; Brendan M. Laurs; Alexander U. Falster; William B. "Skip" Simmons
- The Journal of Gemmology