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Brodtkorbite (Brodtkorbit)

Collectors Summary

Color dunkelgrau
Streak color dunkelgrau
Lustre Metallglanz
Hardness (Mohs) 2.5 - 3
Cleavages keine
Fracture uneben
Crystal System monoklin, P21/n
Morphology in xenomorphen Körnern von 10 x 20 bis 50 x 100 µm, in Kornaggregaten bis 150 x 250 µm

Chemism

Chemical formula

Cu2HgSe2

Chemical composition

Kupfer, Quecksilber, Selen

Unit weight: 485.6106 u; Number of atoms in the formula: 5

Info

Empirical formula:

Cu2HgSe2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Copper

Cu

26.17

2

40.00

63.5463000

127.0926000
Selenium

Se

32.52

2

40.00

78.9630000

157.9260000
Mercury

Hg

41.31

1

20.00

200.5920000

200.5920000

Analysis wt%

Ø Cu : 26.20, Hg : 40.70, Se : 32.90 (Ref: Canadian Mineralogist 2002)

Strunz 9th edition incl. updates

2.BD.55

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
B: Metallsulfide, M : S > 1 : 1 (hauptsächlich 2 : 1)
D: mit Quecksilber (Hg), Thallium (Tl)
55:Brodtkorbit-Gruppe

Lapis Classification

II/B.06-055

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
B: Sulfide, Selenide und Telluride mit Verhältnis Metall : S,Se,Te > 1:1
6: Sulfide, Selenide und Telluride mit vorwiegend Kupfer und Silber/Gold

Classification by Hölzel

2.BD.145

2: SULFIDES
B: Sulfides (etc) with Me/S > 1/1 (mostly 2/1)
D: With Hg,Tl,(Na,K)
1: Balkanite-Imiterite-Group (with Hg)

Dana 8th edition

02.05.08.02

02: Sulfide Minerals
05: Sulfides - Including Selenides and Tellurides where Am Bn Xp, with (m+n):p=3:2

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

dunkelgrau

Streak color

dunkelgrau

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

2V angle

Biaxial

Pleochroism

Schwach bis mäßig; blassrosa bis blassblau

Bireflectance

Schwach bis stark

Anisotropism

Schwach bis stark; lila-grau bis gelblich grau

Reflectivity: (Lambda nm) ↓, ↑, Ø

(400) 30.70, 38.10, 34.40
(420) 30.60, 38.20, 34.40
(440) 30.40, 37.90, 34.15
(460) 29.90, 37.30, 33.60
(480) 29.30, 36.60, 32.95
(500) 28.60, 36.00, 32.30
(520) 28.00, 35.60, 31.80
(540) 27.50, 35.20, 31.35
(560) 27.10, 35.00, 31.05
(580) 26.80, 34.80, 30.80
(600) 26.40, 34.50, 30.45
(620) 26.20, 34.30, 30.25
(640) 26.10, 34.20, 30.15
(660) 26.10, 33.90, 30.00
(680) 26.30, 33.60, 29.95
(700) 26.40, 33.30, 29.85
Reflection chart Brodtkorbite

Reflectivity Ø

31.72

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

7.492

Cell parameters b (Å)

4.177

Cell parameters c (Å)

7.239

Cell parameters a/b or c/a

1.794

Cell parameters c/b

1.733

Cell parameters α

90°

Cell parameters β

114.20

Cell parameters γ

90°

Z

2

Volumne (ų)

206.63

Kristall structure

Jiří Sejkora, Pavel Škácha, František Laufek, Jakub Plášil: Brodtkorbite, Cu2HgSe2, from Příbram, Czech Republic: crystal structure and description. European Journal of Mineralogy Vol. 29 Nr. 4 (2017) S. 663-672.

X-Ray Powder Diffraction

3.991(70),
3.576(50),
3.534(50),
3.414(50),
2.730(100),
2.223(70),
2.072(50)
XRD chart Brodtkorbite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

in xenomorphen Körnern von 10 x 20 bis 50 x 100 µm, in Kornaggregaten bis 150 x 250 µm

Physical Properties

Hardness (Mohs)

2.5 - 3

VHN (Hardness Vickers)

91 - 131, 118 (10g)

Density (g/cm³)

7.77 (berechnet)

7.805 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Argentinien/La Rioja, Provinz/General Lamadrid, Departamento/Villa Castelli/Sierra de Cacho/Tumiñico Mine

Type material

Institute of Mineralogy, University of Salzburg, Österreich

The Natural History Museum, London, England

Collection number of type material

14600–14602 (Österreich); 1998,173 (England)

Paragenesis of type material

Uraninit, Umangit, Krutait-Trogtalit Serie, Tiemannit, Quecksilber-haltiger Cadmoselit, Klockmannit, Hakit Ferroselit, Eucairit, Eskebornit, Kupfer-haltiger Cadmoselit, Chaméanit, Bellidoit

Preface

Occurrences

Gelegentlich in einer telethermalen, selenreichen, hydrothermalen, polymetallischen Lagerstätte in Kalzit Adern in Amphiboliten, unter 112°C gebildet

Associations

Berzelianit, Eucairit, Klockmannit, Tiemannit, Umangit

Name from

Dr. Milka Kronegold de Brodtkorb (1932 - ) Professor der Universität von Buenos Aires und La Plata, Argentinien

Author (Name, Year)

Paar & Topa & Roberts & Criddle & Amann & Sureda, 2002

Additional Information

Name zu Ehren von Dr. Milka Kronegold de Brodtkorb

References

Paar, W.H., D. Topa, A.C. Roberts, A.J. Criddle, G. Amann, and R.J. Sureda (2002) The new mineral species brodtkorbite, Cu2HgSe2, and the associated selenide assemblage from Tuminico, Sierra de Cacho, La Rioja, Argentina. Canadian Mineralogist 40 (2002), 225-238

American Mineralogist, 87 (2002), 1731

Sejkora, J., Skácha, P., Laufek, F., Plásil, J. (2017) Brodtkorbite, Cu2HgSe2, from Príbram, Czech Republic: crystal structure and description. European Journal of Mineralogy 29 (2017), 663-672

Other languages

German

Brodtkorbit

Spanish

Brodtkorbita

French

Brodtkorbite

English

Brodtkorbite

Russian

Бродткорбит

Traditional Chinese

硒汞銅礦

Simplified Chinese

硒汞铜矿

CNMNC (IMA)-Number

IMA 1999-023

CNMNC symbol

Symbol

Bdk

Locations with GPS information