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Brodtkorbite

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Formula:
Cu2HgSe2
Colour:
Dark grey
Lustre:
Metallic
Hardness:
2½ - 3
Specific Gravity:
7.77 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Milka Kronegold de Brodtkorb (05 July 1932, Ciudad de Buenos Aires, Argentina - 18 July 2019, Córdoba, Argentina), Professor at the Universities of Buenos Aires and La Plata, Argentina, for her contributions to mineralogy (especially that of Argentina) and economic geology. She coauthored the description of four minerals: suredaite, angelaite, jagueite, coiraite.
This page provides mineralogical data about Brodtkorbite.


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Classification of BrodtkorbiteHide

Approved
Approval Year:
1999
First Published:
2002
2.BD.55

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
D : With Hg, Tl

Physical Properties of BrodtkorbiteHide

Metallic
Transparency:
Opaque
Colour:
Dark grey
Streak:
Dark grey
Hardness:
2½ - 3 on Mohs scale
Hardness:
VHN10=118 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
7.77 g/cm3 (Calculated)

Optical Data of BrodtkorbiteHide

Type:
Anisotropic
Anisotropism:
Weak to strong
Bireflectance:
Strong
Reflectivity:
470nmR1=29.60%R2= 37.10%imR1= 15.15%imR2= 22.00%
546nmR1=27.40%R2= 35.10%imR1= 13.30%imR2= 20.15%
589nmR1=26.60%R2= 34.60%imR1= 12.70%imR2= 19%
650nmR1=26.10%R2= 34.10%imR1= 12.30%imR2= 19.25%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 37.10%.
R1 shown in black, R2 shown in red, imR1 shown in green, imR2 shown in blue
Colour in reflected light:
White
Pleochroism:
Visible
Comments:
Weak to Moderate

Chemical Properties of BrodtkorbiteHide

Formula:
Cu2HgSe2

Crystallography of BrodtkorbiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 7.492 Å, b = 4.177 Å, c = 7.239 Å
β = 114.2°
Ratio:
a:b:c = 1.794 : 1 : 1.733
Unit Cell V:
206.6 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.991 Å(70)
3.576 Å(50)
3.534 Å(50)
3.414 Å(50)
2.730 Å(100)
2.223 Å(70)
2.072 Å(50)
_312)Å(

Type Occurrence of BrodtkorbiteHide

General Appearance of Type Material:
Anhedral grains from 10x20 µm to 50 x 100 µm and aggregates reaching 150 x 250 µm
Geological Setting of Type Material:
In a telethermal selenide vein-type assemblage
Associated Minerals at Type Locality:
Reference:
Paar, W.H., Topa, D., Roberts, A.C., Criddle, A.J., Amann, G., Sureda, R.J. (2002) The new mineral species brodtkorbite, Cu2HgSe2, and the associated selenide assemblage from Tuminico, Sierra de Cacho, La Rioja, Argentina. The Canadian Mineralogist: 40: 225-237.

Synonyms of BrodtkorbiteHide

Other Language Names for BrodtkorbiteHide

Simplified Chinese:硒汞铜矿
Spanish:Brodtkorbita
Traditional Chinese:硒汞銅礦

Related Minerals - Nickel-Strunz GroupingHide

2.BD.UM2004-33-S:AgCuHgSe(Ag,Cu)8Hg3(S,Se)7
2.BD.05ImiteriteAg2HgS2Mon.
2.BD.10GortdrumiteCu24Fe2Hg9S23Tric. 1 : P1
2.BD.15BalkaniteCu9Ag5HgS8Mon. 2/m : P2/m
2.BD.15Danielsite(Cu,Ag)14HgS8Orth.
2.BD.20DonharrisiteNi3HgS3Mon. 2/m : B2/m
2.BD.25CarliniteTl2STrig. 3 : R3
2.BD.30BukoviteTl2(Cu,Fe)4Se4Tet.
2.BD.30MurunskiteK2(Cu,Fe)4S4Tet.
2.BD.30ThalcusiteTl2Cu3FeS4Tet.
2.BD.35Rohaite(Tl,Pb,K)2Cu8.7Sb2S4Orth.
2.BD.40ChalcothalliteTl2(Cu,Fe)6SbS4Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
2.BD.45SabatieriteCu6TlSe4Orth.
2.BD.50CrookesiteCu7(Tl, Ag)Se4Tet.

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 BrodtkorbiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Paar, W.H., Topa, D., Roberts, A.C., Criddle, A.J., Amann, G., Sureda, R.J. (2002) The new mineral species brodtkorbite, Cu2HgSe2, and the associated selenide assemblage from Tuminico, Sierra de Cacho, La Rioja, Argentina. The Canadian Mineralogist: 40: 225-237.
Jambor, J.L., Roberts, A.C. (2002) New mineral names. American Mineralogist: 87: 1731-1735.
Mandarino, J.A. (2002) New minerals. The Canadian Mineralogist: 40: 1527-1550.
Sejkora, J., Škácha, P., Laufek, F., Plášil, J. (2017) Brodtkorbite, Cu2HgSe2, from Příbram, Czech Republic: crystal structure and description. European Journal of Mineralogy: 29: 663-672.

Internet Links for BrodtkorbiteHide

Localities for BrodtkorbiteHide

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)
 
  • La Rioja Province
    • General Lamadrid department
      • Villa Castelli
        • Sierra de Cacho
Canadian Mineralogist(2002) 40, 225-237; Milka K. de Brodtkorb (2002) Las Especies Minerales de la Republica Argentina. Vol. 1 (elements, sulphides and sulphosalts). (Asociacion Mineralogica Argentina); de Brodtkorb, M. K., & Crosta, S. (2010). Reseña de la ubicación geográfica de los seleniuros de la Sierra de Umango, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 67(2), 272-279.; Grundmann, G., & Förster, H. J. (2018). The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina. Minerals, 8(4), 127.
Czech Republic
 
  • Central Bohemian Region
Škácha, P., Sejkora, J., & Plášil, J. (2017). Selenide mineralization in the Příbram uranium and base-metal district (Czech Republic). Minerals, 7(6), 91.
 
Mineral and/or Locality  
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