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Coiraite

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Beatriz L. Coira
Formula:
(Pb,Sn)12.5Sn5FeAs3S28
Colour:
grey to dark-grey
Lustre:
Metallic, Dull
Hardness:
2
Specific Gravity:
5.92 (Calculated)
Crystal System:
Monoclinic
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.


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Classification of CoiraiteHide

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

Physical Properties of CoiraiteHide

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

Optical Data of CoiraiteHide

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 CoiraiteHide

Formula:
(Pb,Sn)12.5Sn5FeAs3S28
IMA Formula:
(Pb,Sn2+)12.5As3Fe2+Sn4+5S28

Crystallography of CoiraiteHide

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 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 DiffractionHide

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)

Type Occurrence of CoiraiteHide

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
Associated Minerals at Type Locality:

Synonyms of CoiraiteHide

Other Language Names for CoiraiteHide

Relationship of Coiraite to other SpeciesHide

Other Members of this group:
FranckeiteFe2+(Pb,Sn2+)6Sn4+2Sb2S14Tric. 1 : P1

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sphalerite1 photo of Coiraite associated with Sphalerite on mindat.org.
Pyrite1 photo of Coiraite associated with Pyrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.HF.20VrbaiteHg3Tl4As8Sb2S20Orth. mmm (2/m 2/m 2/m) : Cmca
2.HF.25aCylindritePb3Sn4FeSb2S14Tric. 1 : P1
2.HF.25bFranckeiteFe2+(Pb,Sn2+)6Sn4+2Sb2S14Tric. 1 : P1
2.HF.25bIncaite(Pb,Ag)4Sn4FeSb2S15Mon.
2.HF.25aLévyclauditePb8Sn7Cu3(Bi,Sb)3S28
2.HF.25bPotosíitePb6Sn3FeSb3S16Tric.
2.HF.25aAbramovitePb2SnInBiS7Tric. 1 : P1
2.HF.30Lengenbachite Ag4Cu2Pb18As12S39Tric.

Other InformationHide

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 CoiraiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 CoiraiteHide

Localities for CoiraiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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