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II - Sulfides
Boulangerite

 
Name   Boulangerite
Chemistry   Pb5Sb4S11
Hardness   2.5
Lustre   metallic
Colour   dull lead grey to black
Streak   black 
Density [g/cm3]   5.8
Crystal habit   monoclinic, crystals rarely, thin, prismatic
Cleavage, Fracture   fracture uneven
other characteristics and occurrences   sparse felted masses, fine-grained and dense, also fibrous, radiating, hair-like fibres
   

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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