Works of "Research Collection"
Place Collected: open pit, 60-67 m level
Place Collected: open pit
Place Collected: Erongo Mtns.
Place Collected: S Black Forest
Place Collected: Schellkopf Quarry
Place Collected: Norra Kärr
Place Collected: open pit, 76 m level
Place Collected: Anti-Atlas Mtns.
Place Collected: open pit, 60-67 m
Place Collected: Modum area
Place Collected: open pit, 60-67 m level
Place Collected: Traversella area mines