SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Grundmannite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About GrundmanniteHide

06992800014951240863708.jpg
Günter Grundmann
Formula:
CuBiSe2
Colour:
Black
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
6.582 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Günter Grundmann (b. 1947, Berlin, Germany), Technical University of Munich, Germany, in recognition of his pioneering work on the El Dragón mine.
Dimorph of:
Isostructural with:
The Se analogue of emplectite.

The two independent selenium positions are in well accordance to two sulfur sites of the isotypic emplectite. Bismuth forms BiSe3 trigonal pyramids, while Cu is present as nearly regular CuSe4 tetrahedra.


Classification of GrundmanniteHide

Approved
Approval year:
2015
First published:
2015

Physical Properties of GrundmanniteHide

Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN20=45 - 61 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven
Density:
6.582 g/cm3 (Calculated)

Optical Data of GrundmanniteHide

Anisotropism:
light-brown to brown rotation tints
Bireflectance:
weak
Reflectivity:
470nmR1=41.0%R2= 43.4%
546nmR1=41.8%R2= 45.1%
589nmR1=42.1%R2= 45.7%
650nmR1=42.5%R2= 46.2%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 46.2%.
R1 shown in black, R2 shown in red
Pleochroism:
Weak
Comments:
from cream to light grey

Chemical Properties of GrundmanniteHide

Formula:
CuBiSe2

Crystallography of GrundmanniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 6.6362(5) Å, b = 4.2581(3) Å, c = 15.3691(9) Å
Ratio:
a:b:c = 1.558 : 1 : 3.609
Unit Cell V:
434.29 ų
Z:
4
Morphology:
usually intergrown with watkinsonite and clausthalite;

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.490 Å(49)
3.318 Å(57)
3.275 Å(100)
2.492 Å(41)
2.331 Å(45)
2.129 Å(33)
1.993 Å(31)
1.947 Å(32)

Type Occurrence of GrundmanniteHide

General Appearance of Type Material:
anhedral to subhedral crystals is usually in the range 50–150 μm, but may approach 250 μm
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Natural History Museum, London, catalogue number BM 2015, 33.
Geological Setting of Type Material:
primary mineral, deposited from an oxidizing low-temperature hydrothermal fluid at the waning stage of selenide-mineral formation (fSe2/fS2 ratio > 1; as (1) shrinkage cracks or interstices filling and (2) independent grains within the matrix
Associated Minerals at Type Locality:
Reference:
Förster, H.-J., Bindi, L., Stanley, C.J. (2015) Grundmannite, CuBiSe2, the Se-analogue of emplectite, a new mineral from the El Dragón mine, Potosí, Bolivia. European Journal of Mineralogy: 28, 467-477.

Synonyms of GrundmanniteHide

Other Language Names for GrundmanniteHide

Relationship of Grundmannite to other SpeciesHide

Other Members of this group:
ChalcostibiteCuSbS2Orth. mmm (2/m 2/m 2/m)
EmplectiteCuBiS2Orth. mmm (2/m 2/m 2/m) : Pmna
PříbramiteCuSbSe2Orth. mmm (2/m 2/m 2/m) : Pnma

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 GrundmanniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Abdelghany A., Abdelmohsen N., Abou El Ela A.H., Abdelwahab D.M. (1990) Dielectric relaxation study of CuBiSe2 in the solid and liquid phases. Indian Journal of Pure and Applied Physics: 28: 329-333.
Postl, W., Paar, W.H. (1997) 1089: Selenide (Petrovicit, Watkinsonit, Clausthalit, Berzelianit, Klockmannit, Umangit) und ged. Gold bzw. Chalkosin, Bornit und Covellin von einem Forstweg südlich Altenberg a.d. Rax, Steiermark. In: Niedermayr, G. et al. (1997) Neue Mineralfunde aus Österreich XLVI. Carinthia II, 187/107, 201. [as unnamed Se analogue of emplectite]
Förster, H.-J., Bindi, L., Stanley, C.J. (2015) Grundmannite, IMA 2015-038. CNMNC Newsletter No. 26, August 2015, page 946. Mineralogical Magazine: 79: 941-947.
Förster, H.-J., Bindi, L., Stanley, C.J. (2015) Grundmannite, CuBiSe2, the Se-analogue of emplectite, a new mineral from the El Dragón mine, Potosí, Bolivia. European Journal of Mineralogy: 28: 467-477. ejm2513_pap_gsw.

Internet Links for GrundmanniteHide

Localities for GrundmanniteHide

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.
Austria
 
  • Styria
    • Bruck-Mürzzuschlag District
      • Neuberg an der Mürz
        • Altenberg an der Rax
          • Eselberg
Postl, W. & Paar, W.H. (1997): 1089: Selenide (Petrovicit, Watkinsonit, Clausthalit, Berzelianit, Klockmannit, Umangit) und ged. Gold bzw. Chalkosin, Bornit und Covellin von einem Forstweg südlich Altenberg a.d. Rax, Steiermark. In: Niedermayr, G. et al. (1997): Neue Mineralfunde aus Österreich XLVI. Carinthia II, 187/107, 201. [as unnamed Se analogue of emplectite]
Bolivia (TL)
 
  • Potosí
    • Antonio Quijarro Province
Förster, H.-J., Bindi, L. and Stanley, C.J. (2015) Grundmannite, IMA 2015-038. CNMNC Newsletter No. 26, August 2015, page 946; Mineralogical Magazine, 79, 941-947.; Förster, H.-J., Bindi, L., Stanley, C.J. (2016): Grundmannite, CuBiSe2, the Se-analogue of emplectite, a new mineral from the El Dragon mine, Potosi, Bolivia. European Journal of Mineralogy, 28, 467-477.; 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
Canada
 
  • Newfoundland and Labrador
    • Newfoundland
      • Burin Peninsula
Sparkes, G. W., Ferguson, S. A., Layne, G. D., Dunning, G. R., O’Brien, S. J., & Langille, A. (2016) The Nature and Timing of Neoproterozoic High-sulphidation Gold Mineralization from the Newfoundland Avalon Zone: Insights from New U–Pb Ages, Ore Petrography and Spectral Data from the Hickey’s Pond Prospect. Current Research (2016) Newfoundland and Labrador Department of Natural Resources
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2021, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us - Report a bug/vulnerability Current server date and time: January 20, 2021 13:46:44 Page generated: January 14, 2021 10:39:16
Go to top of page