Most commonly in low-temperature hydrothermal veins; also in moderate temperature and high-temperature deposits, usually among the last minerals formed.
IMA Status:
Valid Species (Pre-IMA) 1835
Locality:
Baia de Aries (Aranyosb�nya, Offenb�nya), Transylvania, Romania. Link to MinDat.org Location Data.
Name Origin:
Named after TranSYLVANia, for the part of Romainia where it was first found..
Chemical Formula: 