(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.
Marian Lupulescu (2009) The 36th Rochester Mineralogical Symposium, April 23-26, programme abstracts, 21-23.; Breithaupt (1846) Poggendorff's Annalen der Physik und Chemie.