User:Chris857/Boulangerite

Boulangerite
Boulangerite
	Boulangerite, covering a block of limestone
General
Category	Sulfosalt mineral
Formula; (repeating unit)	Pb5Sb4S11
Strunz classification	2.HC.15
Dana classification	3.5.2.1
Crystal system	Monoclinic
Space group	H-M group: 2/m; Space group: P21/a
Unit cell	a = 21.612(7) Å; b = 23.543(8) Å; c = 8.084(3) Å; β = 100.71(2)°, Z=8
Identification
Color	Lead grey
Cleavage	Distinct on {100}
Tenacity	Brittle, ﬂexible in thin crystals
Mohs scale hardness	2.5–3
Luster	Metallic, sometimes silky
Streak	Brownish
Diaphaneity	Opaque
Pleochroism	Weak
Ultraviolet fluorescence	Non-fluorescent
References

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Description

Occurrence

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

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

^ ^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.
^ "Boulangerite". Webmineral. Retrieved April 1, 2013.
^ ^a ^b ^c ^d "Boulangerite". Mindat. Retrieved March 31, 2013.
^ ^a ^b Thaulow 1837, p. 221.

Bibliography

Thaulow, M. C. J. (1837). "Analyse eines antimonerzes vom Nasafjeld in Lapland" (PDF). Annalen der Physik und Chemie (in German). 41: 216–221.

External links

Media related to boulangerite at Wikimedia Commons

http://webmineral.com/data/Boulangerite.shtml

http://rruff.info/boulangerite/display=default/R050436

[handbook-1] Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Boulangerite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.

[webmin-2] "Boulangerite". Webmineral. Retrieved April 1, 2013.

[mindat-3] "Boulangerite". Mindat. Retrieved March 31, 2013.

[FOOTNOTEThaulow1837221-4] Thaulow 1837, p. 221.

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