(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
| Germany | | |
| Urbigkeit, k. (1987): Die Mineralien der Kalkgrube Lieth bei Elmshorn. LAPIS 12 (2), 25-29 | | USA | | |
| Jay Ellis Ransom,1974,Gems and Minerals of America |
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