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Eldragónite

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About EldragóniteHide

Formula:
Cu6BiSe4(Se2)
Colour:
Brownish to light-maroon
Lustre:
Metallic
Hardness:
Crystal System:
Orthorhombic
Name:
Named for the type locality.
This page provides mineralogical data about Eldragónite.


Classification of EldragóniteHide

Approved
Approval Year:
2011

Physical Properties of EldragóniteHide

Metallic
Transparency:
Opaque
Colour:
Brownish to light-maroon
Streak:
Brownish black
Hardness:
3½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Conchoidal

Optical Data of EldragóniteHide

Type:
Isotropic
Anisotropism:
Strongly with rotation tints in shades of orange and blue-black
Bireflectance:
Distinctly
Reflectivity:
470 nmR1=32.5-34.5%R2= 17.7–19.7%
546 nmR1=32.95–36.3%R2= 18.0–21.4%
589 nmR1=33.3–36.8%R2= 18.3–21.6%
650 nmR1=34.0–36.9%R2= 19.1–21.7%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 34.0–36.9%.
R1 shown in black, R2 shown in red
Internal Reflections:
Lacks internal reflections
Pleochroism:
Visible
Comments:
distinctly, light grayish brown to cream.

Chemical Properties of EldragóniteHide

Formula:
Cu6BiSe4(Se2)
IMA Formula:
Cu6BiSe4(Se2)

Crystallography of EldragóniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.0341(4) Å, b = 27.056(3) Å, c = 9.5559(9) Å
Ratio:
a:b:c = 0.149 : 1 : 0.353
Unit Cell V:
1,042.99 ų (Calculated from Unit Cell)
Morphology:
As anhedral grains and polycrystalline aggregates attaining a size of up to 100 X 80 µm.
Comment:
Space group Pmcn (non-standard).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.547 Å(58)
3.579 Å(100)
3.180 Å(77)
3.165 Å(56)
3.075 Å(84)
2.011 Å(53)
1.920 Å(76)
1.846 Å(52)

Type Occurrence of EldragóniteHide

General Appearance of Type Material:
As inclusions in krutaite
Place of Conservation of Type Material:
Holotype is is deposited in the collections of the Canadian Museum of Nature, Ottawa, Canada, registered as CMNMC 86154.
Geological Setting of Type Material:
A selenide vein a telethermal deposit hosted in sandstones and shales of Devonian age.
Associated Minerals at Type Locality:

Synonyms of EldragóniteHide

Other Language Names for EldragóniteHide

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 EldragóniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cooper, M.A., Moëlo, Y., Paar, W.H., Raith, J.G., Rowe, R., Roberts, A.C., Stirling, J., Stanley, C.J. (2011) Eldragónite, IMA 2010-077. CNMNC Newsletter No. 8, April 2011, page 293; Mineralogical Magazine, 75, 289-294.
Werner, H.P., Coopper, M.K., Moelo, Y., Stanley, C.J., Putz, H., Topa, D. (2012) Eldragonite, Cu6BiSe4(Se-2), A new mineral species from the El Dragon Mine, Potosi, Bolivia, and its crystal structure. Canadian Mineralogist: 50: 282-294.

Internet Links for EldragóniteHide

Localities for EldragóniteHide

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
 
  • La Rioja Province
    • Famatina department
      • Famatina
        • Puerto Alegre
Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
Bolivia (TL)
 
  • Potosí
    • Antonio Quijarro Province
Cooper, M.A., Moëlo, Y., Paar, W.H., Raith, J.G., Rowe, R., Roberts, A.C., Stirling, J. and Stanley, C.J. (2011) Eldragónite, IMA 2010-077. CNMNC Newsletter No. 8, April 2011, page 293; Mineralogical Magazine, 75, 289-294.; Werner, H.P., Coopper, M.K., Moëlo, Y., Stanley, C. J., Putz, H. & Topa, D. (2012): Eldragonite, Cu6BiSe4(Se-2), A new mineral species from the El Dragon Mine, Potosi, Bolivia, and its crystal structure. Canadian Mineralogist: 50, 282-294.; Grundmann, G. and Förster H.-J. (2017) Origin of the El Dragón Selenium Mineralization, Quijarro Province, Potosí, Bolivia. Minerals, 7(5), 68; doi:10.3390/min7050068
 
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