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Cerromojonite

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About CerromojoniteHide

Formula:
CuPbBiSe3
Colour:
Black
Lustre:
Metallic
Specific Gravity:
7.035 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for Cerro Mojon, the highest mountain peak closest to the type locality (El Dragón mine).
The Se analogue of součekite.


Classification of CerromojoniteHide

Approved
Approval Year:
2018
First Published:
2018

Physical Properties of CerromojoniteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
no obvious parting
Fracture:
Irregular/Uneven
Density:
7.035 g/cm3 (Calculated)

Optical Data of CerromojoniteHide

Type:
Anisotropic
Anisotropism:
Weakly anisotropic between crossed polarizers
Reflectivity:
470 nmR1=48.8%R2= 50.3%
546 nmR1=48.2%R2= 51.8%
589 nmR1=47.8%R2= 52.05%
650 nmR1=47.2%R2= 52.0%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 52.05%.
R1 shown in black, R2 shown in red
Internal Reflections:
None
Pleochroism:
Weak
Comments:
Weakly pleochroic

Chemical Properties of CerromojoniteHide

Formula:
CuPbBiSe3

Crystallography of CerromojoniteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 8.202(1) Å, b = 8.741(1) Å, c = 8.029(1) Å
Ratio:
a:b:c = 0.938 : 1 : 0.919
Unit Cell V:
575.7 ų
Z:
4
Morphology:
As minute grains (< 30 µm in size); as elongated, thin-tabular crystals (up to 200 μm long and 40 μm wide).
Twinning:
Lamellar twinning on {110} is common
Comment:
Spacegroup: Pn21m

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.00Å(20)
3.86Å(25)
2.783Å(100)
2.727Å(55)
2.608Å(40)
1.999Å(25)
1.992Å(20)
1.788Å(20)

Type Occurrence of CerromojoniteHide

General Appearance of Type Material:
As minute grains (up to 30 µm in size) in interstices of hansblockite/quijarroite intergrowths, forming an angular network-like intersertal texture, or as elongated, thin-tabular crystals (up to 200 μm long and 40 μm wide) within lath-shaped or acicular m
Place of Conservation of Type Material:
In the mineralogical collections of the Natural History Museum, London, United Kingdom, catalogue number BM 2018,11 (polished section), and the Mineralogical State Collection – Museum Reich der Kristalle, München, Germany, inventory number MSM 73583 (coty
Empirical Formula of Type Material:
(Cu0.89Hg0.11)Σ = 1.00(Pb0.56Ag0.16Hg0.15Bi0.11Fe0.01)Σ = 0.99Bi1.00Se3.01
Chemical Analysis of Type Material:
Cu7.91 %
Ag2.35 %
Hg7.42 %
Pb16.39 %
Fe0.04 %
Ni0.02 %
Bi32.61 %
Se33.37 %
Total:100.11 %
Associated Minerals at Type Locality:
Reference:
Förster, H.-J., Bindi, L., Grundmann, G., Stanley, C.J. (2018): Cerromojonite, CuPbBiSe3, from El Dragόn (Bolivia): A New Member of the Bournonite Group. Minerals, 8: 420

Synonyms of CerromojoniteHide

Other Language Names for CerromojoniteHide

Relationship of Cerromojonite to other SpeciesHide

Other Members of this group:
BournonitePbCuSbS3Orth. mm2 : Pmn21
SeligmannitePbCuAsS3Orth. mmm (2/m 2/m 2/m) : Pmmn
SoučekitePbCuBi(S,Se)3Orth.

Fluorescence of CerromojoniteHide

Non-fluorescent

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 CerromojoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Förster, H.-J., Bindi, L., Grundmann, G. and Stanley, C.J. (2018) Cerromojonite, IMA 2018-040. CNMNC Newsletter No. 44, August 2018, page xxx; Mineralogical Magazine: 82: xxx–xxx.
Förster, H.-J., Bindi, L., Grundmann, G., Stanley, C.J. (2018): Cerromojonite, CuPbBiSe3, from El Dragόn (Bolivia): A New Member of the Bournonite Group. Minerals, 8: 420; https://doi.org/10.3390/min8100420.

Internet Links for CerromojoniteHide

Localities for CerromojoniteHide

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
    • Antonio Quijarro Province
Förster, H.-J., Bindi, L., Grundmann, G. and Stanley, C.J. (2018) Cerromojonite, IMA 2018-040. CNMNC Newsletter No. 44, August 2018, page xxx; Mineralogical Magazine: 82: xxx–xxx.; Förster, H.-J., Bindi, L., Grundmann, G., Stanley, C.J. (2018): Cerromojonite, CuPbBiSe3, from El Dragόn (Bolivia): A New Member of the Bournonite Group. Minerals, 8: 420
 
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