Works of "Research Collection"
Place Collected: Nordmark
Place Collected: Santa Rita
Place Collected: Minas Gerais
Place Collected: village 20 km from Amizmiz
Place Collected: near Wunsiedel
Place Collected: Esashi district
Place Collected: Grundy Co.
Place Collected: on Vesuvius
Place Collected: Kunibert Mine
Place Collected: Gobitschau
Place Collected: Sjö Mine
Place Collected: Portoferraio