Brodtkorbite Mineral Data

General Brodtkorbite Information

Chemical Formula:

Cu2HgSe2

Composition:

Molecular Weight = 485.60 gm

Copper 26.17 % Cu

Mercury 41.31 % Hg

Selenium 32.52 % Se

______

100.00 %

Empirical Formula:

Cu₂HgSe₂

Environment:

Telethermal selenide vein-type assemblage. Possibly related to Ag2HgS2 (Imiterite)

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Tuminico, Bajo Jugüe, Sierra de Cacho, Sierra de Umango, La Rioja, Argentina. Link to MinDat.org Location Data.

Name Origin:

Named for Milka Kronegold de Brodtkorb (1932-), Professor at the University of Buenos Aries and La Plata, Argentina

Synonym:

IMA1999-023

Brodtkorbite Image

Images:

Brodtkorbite

Comments: Polished section with partially crossed polarizers showing brodtkorbite (br) in association with tiemannite (ti) and berzelianite (bz). (CanMin, v40:225).
Location: Telethermal selenide vein-type assemblage at the Tuminico Ia selenium deposit, Sierra de Cacho (Sierra de Umango) district, La Rioja, Argentina. Scale: Picture Size 0.5 x 0.35 mm.
© Canadian Mineralogist

Brodtkorbite Crystallography

Axial Ratios:

a:b:c =1.7936:1:1.733

Cell Dimensions:

a = 7.492, b = 4.177, c = 7.239, Z = 2; beta = 114.2° V = 206.63 Den(Calc)= 7.80

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.73(1)(112), 2.223(0.7)(211), 3.991(0.7)(101),2.072(0.5)(113,312), 3.414(0.5)(200), 3.534(0.5)(011), 3.576(0.5)(110),

Physical Properties of Brodtkorbite

Cleavage:

None

Color:

Dark gray.

Diaphaneity:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Metallic

Streak:

dark gray

Optical Properties of Brodtkorbite

RL Anisotrophism:

Weak to strong.

RL Bireflectance:

Strong.

RL Color:

White.

RL Pleochroism:

Weak to moderate.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	29.60	37.10
546 nm	27.40	35.10
589 nm	26.60	34.60
650 nm	26.10	34.10

**Standardized Intensity (100%) Reflection Spectra of Brodtkorbite in Oil**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	15.15	22.00
546 nm	13.30	20.15
589 nm	12.70	19.80
650 nm	12.30	19.25

**Calculated Relative Intensity Colors of Brodtkorbite in Air**
Relative Intensity	0%	40%	80%	100%	120%	160%	200%	240%	280%	320%	330%
R₁
R₂

**Calculated Relative Intensity Colors of Brodtkorbite in Oil**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	700%
R₁
R₂

Calculated Properties of Brodtkorbite

Electron Density:

Bulk Density (Electron Density)=6.62 gm/cc
note: Specific Gravity of Brodtkorbite =7.80 gm/cc.

Fermion Index:

Fermion Index = 0.14
Boson Index = 0.86

Photoelectric:

PE_Brodtkorbite= 728.96 barns/electron
U=PE_Brodtkorbite x rElectron Density=4,824.10 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Brodtkorbite is Not Radioactive

Brodtkorbite Classification

Dana Class:

02.05.08.02 (02)Sulfides - Including Selenides and Tellurides

(02.05)where Am Bn Xp, with (m+n):p=3:2

(02.05.08)Dana Group

02.05.08.01 Imiterite Ag2HgS2 P 2₁/c 2/m

02.05.08.02 Brodtkorbite! Cu2HgSe2 P 2₁/n 2/m

Strunz Class:

02.BD.55 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BD -With Hg, Tl

02.BD.55 Brodtkorbite! Cu2HgSe2 P 2₁/n 2/m

Other Brodtkorbite Information

References:

NAME( MinRec, vol 34, p 203) PHYS. PROP.(MinRec, vol 34, p 203) OPTIC PROP.(MinRec, vol 34, p 203)

See Also:

Links to other databases for Brodtkorbite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Ask about Brodtkorbite here :
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Print or Cut-and-Paste your Brodtkorbite Specimen Label here :

Brodtkorbite

Cu2HgSe2
Dana No: 02.05.08.02 Strunz No: 02.BD.55
Locality:

Notes: