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Beudantite

Secondary mineral of the alunite group

Summary

Secondary mineral of the alunite group

Field	Value
name	Beudantite
category	Arsenate minerals
image	Beudantite-ea12a.jpg
imagesize	170px
caption	Large brown crystals of beudantite
formula	PbFe3(OH)6SO4AsO4
IMAsymbol	Bdn
strunz	8.BL.10
dana	43.4.1.1
system	Trigonal
class	Hexagonal scalenohedral (m)
H-M symbol: ( 2/m)
symmetry	Rm
unit cell	a = 7.32 Å, c = 17.02 Å; Z = 3
color	black, dark green, brown, yellowish, red, greenish yellow, brown
habit	tabular, acute rhombohedral, pseudo-cubic, pseudo-cuboctahedral
cleavage	distinct; good on {0001}
mohs	3.5–4.5
luster	vitreous, resinous
refractive	nω = 1.957 nε = 1.943
opticalprop	Uniaxial (−)
birefringence	δ = 0.014
pleochroism	visible
streak	grayish yellow to green
gravity	4.48
diaphaneity	transparent, translucent
other	Soluble in HCl
references

H-M symbol: ( 2/m)

Beudandite is a secondary mineral occurring in the oxidized zones of polymetallic deposits. It is a lead, iron, arsenate, sulfate with endmember formula: PbFe3(OH)6SO4AsO4.

Beudantite is in a subgroup of the alunite group. It is the arsenate analogue of the phosphate corkite. Beudantite also forms a solid-solution with segnitite and plumbojarosite.

It crystallizes in the trigonal crystal system and shows a variety of crystal habits including tabular, acute rhombohedral, pseudo-cubic and pseudo-cuboctahedral.

It occurs in association with carminite, scorodite, mimetite, dussertite, arseniosiderite, pharmacosiderite, olivenite, bayldonite, duftite, anglesite, cerussite and azurite.

Discovery

Beudantite was first described in 1826 for an occurrence in the Louise Mine, Wied Iron Spar District, Westerwald, Rhineland-Palatinate, Germany. It was named by Armand Lévy after his fellow Frenchman and mineralogist François Sulpice Beudant (1787–1850).

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.mindat.org/min-652.html Mindat.org]
[http://webmineral.com/data/Beudantite.shtml Web Mineral data]
[http://rruff.geo.arizona.edu/doclib/hom/beudantite.pdf Handbook of Mineralogy]

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

sulfate-minerals arsenate-minerals iron-minerals lead-minerals trigonal-minerals minerals-in-space-group-166 beudantite-group

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