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Name: |
boulangerite (Mullanite) |
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Class: |
Sulfides |
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Chemistry: |
Pb5 Sb4 S11 |
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Color(s): |
mettalic lloking, gray, black streak: reddish-brown |
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Hardness: |
2.5 |
SpecGrav: |
5.7 - 6.3 |
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Fracture: |
brittle |
Cleavage: |
indistinct |
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Crystal: |
Monoclinic - prismatic Acicular - Occurs as needle-like crystals., Massive - Fibrous |
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Envronment: |
present in lead-ore deposits |
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Association: |
galena, stibnite, sphalerite, pyrite, quartz |
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Locals: |
| Germany | USSR | S.D., USA | |
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Misc: |
Named for a mining engineer, C. L. Boulanger, France. |
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Photos |
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1.) Zacatecas, Mexico |
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