Mineralpedia Details for Felsobanyaite
Receives its name from the Baia Sprie mine in Maramures Co., Romania, which was formerly called the Felsobanya mine when the area was a part of Hungary. Felsobanyaite is an uncommon product of oxidized marcasite ore and can be found in additional localities in Australia, Austria, the Czech Republic, Poland, France, Hungary, Ukraine, Slovakia, Italy, England, Ireland, the United States, Bolivia, China, and Japan. Associated minerals include marcasite, stibnite, baryte, and quartz.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/felsobanyaite.pdf
Felsobanyaite from Prullans, La Cerdanya, Lérida, Catalonia, Spain
White globular to platy crystals up to 1mm with blue Allophane.
Felsobanyaite from Bisbee, Cochise Co., Arizona, United States
Blue pulverulent masses in hematitic matrix with a bit of Azurite.