In hydrothermally altered rhyolitic, tuffaceous rocks. An orthorhombic polymorph of corderoite.
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
The McDermitt open pit mercury mine, about 10 km southwest of the town of McDermitt, Humboldt County, Nevada, USA. Link to MinDat.org Location Data.
Name Origin:
For Dr. Kenneth Junghwa Hsu (1929-), Professor Emeritus, Swiss Federal Institute of Technonogy, Zurich, Switzerland.