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Mineralpedia Details for Felsobanyaite

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Felsobanyaite

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

Formula
Al4(SO4)(OH)10ยท4H2
Crystal System
Hexagonal 
Crystal Habit
Globular, Radial, Aggregates 
Cleavage
Perfect, Distinct, Distinct 
Luster
Vitreous - Pearly 
Color
colorless, yellow, white 
Class
Hexagonal 
Hardness
1.5 
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Felsobanyaite from Prullans, La Cerdanya, Lérida, Catalonia, Spain

Felsobanyaite
            from Prullans, La Cerdanya, Lérida, Catalonia, Spain

White globular to platy crystals up to 1mm with blue Allophane.

Click thumbnail images for larger view.

Felsobanyaite from Bisbee, Cochise Co., Arizona, United States

Felsobanyaite
            from Bisbee, Cochise Co., Arizona, United States

Blue pulverulent masses in hematitic matrix with a bit of Azurite.

Click thumbnail images for larger view.

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