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Coiraite

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Formula:
(Pb,Sn)12.5Sn5FeAs3S28
System:
Monoclinic
Colour:
grey to dark-grey
Hardness:
2
Name:
Named after Beatriz Lydia Coira (born 1941), Professor of Petrology at the University of Jujuy, NW Argentina, for her outstanding research on volcanism, regional geology and its relation to ore-deposit formation in Argentina
The As analogue of Franckeite.

Classification of Coiraite

Approved
Approval Year:
2005
2.HF.25b

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
F : With SnS and PbS archetype structure units
mindat.org URL:
http://www.mindat.org/min-27610.html
Please feel free to link to this page.

Type Occurrence of Coiraite

General Appearance of Type Material:
very dense, earthy and fine-grained aggregates with a distinct colloform texture
Place of Conservation of Type Material:
Department of Materials Engineering and Physics, University of Salzburg, Austria, registered under catalogue numbers 14943-14946, in the reference collections of the Natural History Museum, London, UK (BM 2008, 47), the Landesmuseum Joanneum, Graz, Styria
Geological Setting of Type Material:
Polymetallic hydrotermal veins in Ordovician sediments of the Acoyte Formation

Physical Properties of Coiraite

Metallic, Dull
Diaphaneity (Transparency):
Opaque
Colour:
grey to dark-grey
Streak:
dark-grey to almost black streak
Hardness (Mohs):
2
Hardness (Vickers):
VHN10=74 kg/mm2
Tenacity:
Flexible
Cleavage:
Perfect
parallel to a basal plane - synthetic
Density:
5.92 g/cm3 (Calculated)

Crystallography of Coiraite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.84(1) Å, b = 5.86(1) Å, c = 17.32(1) Å
β = 94.14(1)°
Ratio:
a:b:c = 0.997 : 1 : 2.956
Unit Cell Volume:
V 591.19 ų (Calculated from Unit Cell)
Z:
4
Comment:
has two monoclinic sub-cells, Q (pseudotetragonal) and H (pseudohexagonal). Above data is for Q cell.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.27 (61)
3.426 (72)
3.345 (87)
3.122 (78)
3.009 (71)
2.966 (94)
2.883 (100)
2.065 (51)

Optical Data of Coiraite

Type:
Anisotropic
Anisotropism:
moderately anisotropic in oil and the rotation tints are brown to bluish-grey
Bireflectance:
very weak in air and oil
Colour in reflected light:
bluish-grey
Pleochroism:
Not Visible

Chemical Properties of Coiraite

Formula:
(Pb,Sn)12.5Sn5FeAs3S28
All elements listed in formula:
Analytical Data:
Analysis from the book by de Brodtkorb
Pb (53.1-54.1)
Sn (17.07-18.6)
Fe (1.5-1.8)
Ag (0.4)
S (19.9-21.5)
Sb (0.6)
As (5.5-5.8)

Relationship of Coiraite to other Species

Other Members of Group:
FranckeiteFe2+(Pb,Sn2+)6Sn24+Sb2S14
2.HF.20VrbaiteHg3Tl4As8Sb2S20
2.HF.25aCylindritePb3Sn4FeSb2S14
2.HF.25bFranckeiteFe2+(Pb,Sn2+)6Sn24+Sb2S14
2.HF.25bIncaite(Pb,Ag)4Sn4FeSb2S15
2.HF.25aLévyclauditePb8Sn7Cu3(Bi,Sb)3S28
2.HF.25bPotosíitePb6Sn3FeSb3S16
2.HF.25aAbramovitePb2SnInBiS7
2.HF.30Lengenbachite Ag4Cu2Pb18As12S39

Other Names for Coiraite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Coiraite

Reference List:
Brodtkorb, M. K. de: Las Especies Minerales de la Republica Argentina (2002) Asociacion Mineralogica Argentina.

Paar, W.H., de Brodtkorb, M.K., Sureda, R.J., Topa, D. (2001): Mineralogía y quimismo de sulfuros y sulfosales de estaño y plomo en las vetas de Mina Pirquitas, Jujuy, Argentina (22°41'S66°28'W). Revista geológica de Chile, 28(2), 259-268.

Paar W H, Moëlo Y, Mozgova N N, Organova N I, Stanley C J, Roberts A C, Culetto F J, Effenberger H S, Topa D, Putz H, Sureda R J, de Brodtkorb M K (2008) Coiraite, (Pb,Sn2+)12.5As3Fe2+Sn4+5S28: a franckeite-type new mineral species from Jujuy Province, NW Argentina. Mineralogical Magazine 72, 1083-1101

Internet Links for Coiraite

Specimens:
The following Coiraite specimens are currently listed for sale on minfind.com.

Localities for Coiraite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Argentina (TL)
 
  • Jujuy
    • Rinconada Department
M. de Brodtkorb (2002)
Paar, W. H., Moëlo, Y., Mozgova, N. N., Organova, N. I., Stanley, C. J., Roberts, A. C., ... & De Brodtkorb, M. K. (2008). Coiraite,(Pb, Sn2+) 12.5 As3Fe2+ S28: a franckeite-type new mineral species from Jujuy Province, NW Argentina. Mineralogical Magazine, 72(5), 1083-1101.
Paar, W. H. (2013): Pirquitasit - erstmals Kristalle aus Argentinien zu sehen. Mineralien-Welt 24 (3), 42-43 (in German).
Mineral and/or Locality  
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