| |
 |
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 Jug�e, 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 - Prismatic H-M Symbol (2/m) Space Group: P 21/n |
| X Ray Diffraction: |
By Intensity(I/Io): 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: |
PEBrodtkorbite = 728.96 barns/electron
U=PEBrodtkorbite 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
Search for Brodtkorbite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Brodtkorbite :
Ask about Brodtkorbite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
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:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.