Gudmundite - Encyclopedia
Class : Sulfides and sulfosalts
Subclass : Sulfides
Crystal system : Monoclinic
Chemistry : FeSbS
Rarity : Rare
Gudmundite is an accessory sulfide of antimony hydrothermal veins. It is the antimonium equivalent of arsenopyrite, gudmundite is much rarer than the latter. It owes its name to its location of discovery : Gudmundstorp (Sweden). It often appears in stubby prisms, frequently twinned, or massive, from a silvery white to light steel gray color.
Main photo : Gudmundite from Uranium Mine No. 19, Dubenec, Príbram District, Czech Republic © Christophe Boutry
Gudmundite in the World
Twinning
Twins are known on {101} by penetration and contact and form crosses and butterflies.
Fakes and treatments
No fakes recorded for this mineral species.
Hardness : 5.5 to 6
Density : 6,72
Fracture : Undeterminated
Streak : Black
TP : Opaque
RI : -
Birefringence : -
Optical character : -
Pleochroism : None
Fluorescence : None
Solubility : -
Magnetism : NoneRadioactivity : None