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Quijarroite

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About QuijarroiteHide

Flag of Antonio Quijarro Province, Bolivia
Formula:
Cu6HgPb2Bi4Se12
Colour:
Black
Lustre:
Metallic
Specific Gravity:
5.771 (Calculated)
Crystal System:
Orthorhombic
Name:
For the Quijarro Province in Bolivia, in which the type locality, El Dragón mine is located.
Chemically similar to petrovicite and 'Unnamed (Cu-Pb-Hg-Bi Selenide)'. It is chemically close to a species termed “Bi-rich petrovicite” from the Schlema-Alberoda U-Se-polymetallic deposit (Erzgebirge, Germany); also somewhat similar to hansblockite.


Classification of QuijarroiteHide

Approved
Approval Year:
2016
First Published:
2016

Physical Properties of QuijarroiteHide

Metallic
Transparency:
Opaque
Colour:
Black
Hardness Data:
Could not be measured
Cleavage:
None Observed
Parting:
None observed
Density:
5.771 g/cm3 (Calculated)

Optical Data of QuijarroiteHide

Type:
Anisotropic
Anisotropism:
Moderately anisotropic (between crossed polars=) with pale orange-brown to blue rotation tints
Reflectivity:
470nmR1=47.7%R2=46.8%
546nmR1=47.4%R2=48.2%
589nmR1=47.1%R2=48.5%
650nmR1=46.6%R2=48.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 48.7%.
R1 shown in black, R2 shown in red
Internal Reflections:
Does not show any internal reflections
Pleochroism:
Weak
Comments:
In plane-polarized incident light, from cream to very slightly more brownish-cream

Chemical Properties of QuijarroiteHide

Formula:
Cu6HgPb2Bi4Se12

Crystallography of QuijarroiteHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmn21
Cell Parameters:
a = 9.2413(8) Å, b = 9.0206(7) Å, c = 9.6219(8) Å
Ratio:
a:b:c = 1.024 : 1 : 1.067
Unit Cell V:
802.10 ų (Calculated from Unit Cell)
Twinning:
Lamellar twinning on {110} common. Rarely parquet twinning

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.36(55)
3.785(60)
3.331(40)
3.291(90)
3.125(100)
2.312(50)
2.078(35)
1.981(30)

Type Occurrence of QuijarroiteHide

General Appearance of Type Material:
As lath-shaped thin plates (up to 150 µm in length and 20 µm in width) intimately (subparallel) intergrown with hansblockite, forming an angular network-like intersertal texture.
Place of Conservation of Type Material:
Type: (1) mineralogical collections of Florence Museum, Italy - catalogue number 3232/I, and (2) the Natural History Museum, London, catalogue number BM2016,26; cotype: the Mineralogical State Collection Munich (Museum “Reich der Kristalle”), MSM 73573.
Associated Minerals at Type Locality:

Synonyms of QuijarroiteHide

Other Language Names for QuijarroiteHide

German:Quijarroit
Spanish:Quijarroita

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 QuijarroiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Förster, H.-J., Bindi, L., Stanley, C.J., Grundmann, G. (2016) Quijarroite, IMA 2016-052. CNMNC Newsletter No. 33, October 2016, page 1140; Mineralogical Magazine: 80: 1135–1144.
Förster, H.-J., Bindi, L., Grundmann, G., Stanley, C.J. (2016) Quijarroite, Cu6HgPb2Bi4Se12, a New Selenide from the El Dragόn Mine, Bolivia. Minerals: 6(4): 123; doi:10.3390/min6040123

Internet Links for QuijarroiteHide

Localities for QuijarroiteHide

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.
Bolivia (TL)
 
  • Potosí Department
    • Antonio Quijarro Province
Förster, H.-J., Bindi, L., Stanley, C.J., Grundmann, G. (2016): Quijarroite, IMA 2016-052. CNMNC Newsletter No. 33, October 2016, page 1140; Mineralogical Magazine: 80: 1135–1144; Förster, H.-J-, Bindi, L., Grundmann, G. and Stanley, C. J. (2016) Quijarroite, Cu6HgPb2Bi4Se12, a New Selenide from the El Dragόn Mine, Bolivia. Minerals: 6(4), 123.
Mineral and/or Locality  
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