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Petříčekite

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About PetříčekiteHide

Formula:
CuSe2
Lustre:
Metallic
Hardness:
2 - 2½
Crystal System:
Orthorhombic
Member of:
Name:
Named in honor of Václav Petříček, crystallographer with the Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic.
Dimorph of:
Isostructural with:
The Cu analogue of ferroselite and kullerudite. Chemically related minerals: athabascaite, bellidoite, berzelianite, klockmannite, umangite.

Associated, i.a., with some unknown selenides.

The structure is based on edge-sharing chains of CuSe6 octahedra, that are parallel to [001]. Sharing of Se2 dimers provides a link between the chains, and the Se–Se bonds are parallel to (001).


Classification of PetříčekiteHide

Approved
Approval Year:
2016
First Published:
2016

Physical Properties of PetříčekiteHide

Metallic
Transparency:
Opaque
Streak:
Black
Hardness:
2 - 2½ on Mohs scale
Hardness:
VHN100=28 - 40 - Vickers
Comment:
ca. 2-2.5
Tenacity:
Brittle

Optical Data of PetříčekiteHide

Type:
Anisotropic
Anisotropism:
light grey-blue to light pink rotation tints
Reflectivity:
470 nmR1=42.35%R2= 41.8%
546 nmR1=42.0%R2= 42.2%
589 nmR1=41.9%R2= 42.35%
650 (values in brackets are Rmin and Rmax, respectively)nmR1=nd (42.05%R2= 42.85%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is nd (42.05%.
R1 shown in black, R2 shown in red
Colour in reflected light:
pale blue grey to pale pinkish
Internal Reflections:
none

Chemical Properties of PetříčekiteHide

Formula:
CuSe2
Common Impurities:
Fe

Crystallography of PetříčekiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Setting:
Pnnm
Cell Parameters:
a = 4.918(2) Å, b = 6.001(2) Å, c = 3.670(1) Å
Ratio:
a:b:c = 0.82 : 1 : 0.612
Unit Cell V:
108.31 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.135 (20)
2.938 (70)
2.639 (100)
2.563 (85)
1.935 (70)
1.834 (30)
1.760 (25)
1.492 (25)

Type Occurrence of PetříčekiteHide

General Appearance of Type Material:
inclusions, to 150 μm, in eucairite grains
Place of Conservation of Type Material:
collections of the Harvard Mineralogical and Geological Museum, Cambridge, MA 02138, USA (reference number MGMH#2016.01)
Associated Minerals at Type Locality:
Reference:
Bindi, L., Förster, H.-J., Grundmann, G., Keutsch, F.N. and Stanley, C.J. (2016) Petříčekite, CuSe2, a new member of the marcasite group from the Předbořice deposit, Central Bohemia Region, Czech Republic. Minerals: 6(2): 33.

Synonyms of PetříčekiteHide

Relationship of Petříčekite to other SpeciesHide

Member of:
Other Members of this group:
FerroseliteFeSe2Orth. mmm (2/m 2/m 2/m) : Pnnm
FrohbergiteFeTe2Orth. mmm (2/m 2/m 2/m) : Pnnm
KulleruditeNiSe2Orth. mmm (2/m 2/m 2/m) : Pnnm
MarcasiteFeS2Orth. mmm (2/m 2/m 2/m) : Pnnm
MattagamiteCoTe2Orth.

Common AssociatesHide

Goethiteα-Fe3+O(OH)
Krut'aiteCuSe2
SeleniumSe

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 PetříčekiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bindi, L., Förster, H.-J., Grundmann, G., Keutsch, F.N. and Stanley, C.J. (2016) Petříčekite, IMA 2015-111. CNMNC Newsletter No. 30, April 2016, page 410; Mineralogical Magazine: 80: 407–413.
Bindi, L., Förster, H.-J., Grundmann, G., Keutsch, F.N. and Stanley, C.J. (2016) Petříčekite, CuSe2, a new member of the marcasite group from the Předbořice deposit, Central Bohemia Region, Czech Republic. Minerals: 6(2): 33. doi:10.3390/min6020033 (http://www.mindat.org/user-8203.html)

Internet Links for PetříčekiteHide

Localities for PetříčekiteHide

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.
Argentina
 
  • Mendoza
    • Luján de Cuyo department
      • Cacheuta
        • Sierra de Cacheuta
          • Cerro de Cacheuta
Bindi, L., Förster, H.-J., Grundmann, G., Keutsch, F.N. and Stanley, C.J. (2016): Petříčekite, CuSe2, a new member of the marcasite group from the Předbořice Deposit, Central Bohemia Region, Czech Republic. Minerals 6(2), 33.
Bolivia
 
  • Potosí Department
    • Antonio Quijarro Province
Luca Bindi, Hans-Jürgen Förster, Günter Grundmann, Frank N. Keutsch and Chris J. Stanley (2016) Petříčekite, CuSe2, a New Member of the Marcasite Group from the Předbořice Deposit, Central Bohemia Region, Czech Republic. Minerals 6(2), 33.
Czech Republic (TL)
 
  • Central Bohemia Region
Luca Bindi, Hans-Jürgen Förster, Günter Grundmann, Frank N. Keutsch and Chris J. Stanley (2016) Petříčekite, CuSe2, a New Member of the Marcasite Group from the Předbořice Deposit, Central Bohemia Region, Czech Republic. Minerals 6(2), 33.
Mineral and/or Locality  
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