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Mineralpedia Details for Gudmundite

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Gudmundite

Gudmundite

Formula
FeSbS 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Crystalline - Fine 
Cleavage
None, None, None 
Luster
Metallic 
Color
silvery white, steel gray 
Streak
grayish black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
5.5-6 
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Gudmundite with Sphalerite from Pribram, Bohemia, Czech Republic

Gudmundite with Sphalerite
            from Pribram, Bohemia, Czech Republic
Special Info
EDS Confirmed

This is a good example of classic hydrothermal carbonate/sulfide vein filling. There is alot going on and more than meets the eye. The Gudmundite, an iron-antimony sulfide is silvery white in an area of 15 x 5mm within dark red Sphalerite crystals. The Sphalerite crystals are about 1mm in size and can be seen as single equidimensional crystals rimming the Gudmundite. Both of these minerals are encapsulated in Quartz. Outward from the Quartz is a carbonate, probably siderite or ankerite. The sequence is repeated on both sides of the Quartz vein. Textbook example, I wish I had more of this to share.

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