Works of "Research Collection"
Place Collected: Laurium Mines
Place Collected: Corkscrew Canyon
Place Collected: Dallas Gem Mine
Place Collected: Minas Gerais
Place Collected: Minas Gerais
Place Collected: Mejillones Island
Place Collected: Minas Gerais
Place Collected: Hudson Bay Zinc Mine
Place Collected: Willis Mtn.
Place Collected: White Cliffs
Place Collected: Eisleben
Place Collected: Good Hope Mine