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Boulangerite
Boulangerite, covering a block of limestone
General
CategorySulfosalt mineral
Formula
(repeating unit)
Pb5Sb4S11
Strunz classification2.HC.15
Dana classification3.5.2.1
Crystal systemMonoclinic
Space groupH-M group: 2/m
Space group: P21/a
Unit cella = 21.612(7) Å
b = 23.543(8) Å
c = 8.084(3) Å
β = 100.71(2)°, Z=8[1]
Identification
ColorLead grey
CleavageDistinct on {100}
TenacityBrittle, flexible in thin crystals
Mohs scale hardness2.5–3
LusterMetallic, sometimes silky
StreakBrownish
DiaphaneityOpaque
PleochroismWeak
Ultraviolet fluorescenceNon-fluorescent[2]
References[3]

Boulangerite is a sulfosalt mineral with formula Pb5Sb4S11. The mineral was named in 1837 for Charles Louis Boulanger (1810–1849).

Description

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Occurrence

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Boulangerite occurs in association with arsenopyrite, galena, pyrite, quartz, siderite, sphalerite, stibnite, and various lead sulfosalts.[1]

Boulangerite has a very wide distribution; it is known from localities in North and South America, Europe, Africa, Asia, and Australia.[3][1]

History

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In 1837, M. C. J. Thaulow named the mineral Boulangerit, in honor of French mining engineer Charles Louis Boulanger.[3][4] Boulanger analyzed a sample of the mineral from France and Thaulow analyzed material from Scandinavia (Lapland).[4]

When the IMA was founded, boulangerite was grandfathered as a valid mineral species.[3]

References

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  1. ^ a b c Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Boulangerite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.
  2. ^ "Boulangerite". Webmineral. Retrieved April 1, 2013.
  3. ^ a b c d "Boulangerite". Mindat. Retrieved March 31, 2013.
  4. ^ a b Thaulow 1837, p. 221.
Bibliography
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Media related to boulangerite at Wikimedia Commons