IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
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 Educators
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
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Grundmannite

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

About GrundmanniteHide

Günter Grundmann
Formula:
CuBiSe2
Colour:
Black
Lustre:
Metallic
Hardness:
2 - 2½
Specific Gravity:
6.582 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after Günter Grundmann, 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

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

Type:
Anisotropic
Anisotropism:
light-brown to brown rotation tints
Bireflectance:
weak
Reflectivity:
470 (41.8–45.1) 546 (42.1–45.7) 589 (42.5–46.2) 650 nmR=41.0–43.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 41.0–43.4%.
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 (49)
3.318 (57)
3.275 (100)
2.492 (41)
2.331 (45)
2.129 (33)
1.993 (31)
1.947 (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:

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, 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
    • 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 Department
    • 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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 23, 2018 06:09:17 Page generated: September 18, 2018 09:49:24
Go to top of page