Quartz from selected localities.
USA | |
| Geol. Survey of the State of New York, Geology of Orange Co., Roes, Heinrich (1895): 452. |
| Lupulescu, Marian: Rocks& Min. -- May/June 2008 |
| Alfredo Petrov observations, 18-03-2009 field trip. |
| Johan Maertens Collection |