| Argentina | | |
| Alfredo Petrov specimen | | China | |
- Guangxi Zhuang Autonomous Region
| | | Mexico | | |
| Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols | | Slovakia | | |
| Koděra, M. et al., 1986 a 1990 : Topografická mineralógia Slovenska, diel 1- 3, Veda – Vydavateľstvo SAV, Bratislava, 1990, 1 – 1590k | | USA | |
- Meteor Crater and vicinity
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