Roterbärite
A valid IMA mineral species
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Formula:
PdBiCuSe3
Colour:
Greyish white
Lustre:
Metallic
Specific Gravity:
7.23 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named after the type locality.
Isostructural with:
A selenio-salt. Chemically the Se analogue of the (Pmmm-structured) malyshevite. Known synthetic analogue. Unique combination of elements.
Unique Identifiers
Mindat ID:
53743
Long-form identifier:
mindat:1:1:53743:0
GUID
(UUID V4):
(UUID V4):
1f19f5a3-bb49-4013-bf8c-044c8d2b62d2
IMA Classification of Roterbärite
Approved
IMA Formula:
PdCuBiSe3
Approval year:
2019
First published:
2020
Classification of Roterbärite
2.GA.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
A : Neso-sulfarsenites, etc. without additional S
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Rbä | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Roterbärite
Metallic
Transparency:
Opaque
Colour:
Greyish white
Streak:
Grey
Tenacity:
Brittle
Density:
7.23 g/cm3 (Calculated)
Optical Data of Roterbärite
Anisotropism:
Weak; pale orange brown to grey rotation tints
Reflectivity:
| Wavelength | R1 | R2 |
|---|---|---|
| 400nm | 38.8% | 41.0% |
| 420nm | 39.6% | 41.6% |
| 440nm | 40.7% | 42.2% |
| 460nm | 41.8% | 42.7% |
| 470nm | 42.4% | 43.0% |
| 480nm | 42.9% | 43.3% |
| 500nm | 43.8% | 43.8% |
| 520nm | 44.6% | 44.2% |
| 540nm | 45.3% | 44.4% |
| 546nm | 45.4% | 44.4% |
| 560nm | 45.8% | 44.6% |
| 580nm | 46.5% | 44.6% |
| 589nm | 46.8% | 44.6% |
| 600nm | 47.0% | 44.6% |
| 620nm | 47.4% | 44.6% |
| 640nm | 47.6% | 44.6% |
| 650nm | 47.7% | 44.6% |
| 660nm | 47.8% | 44.6% |
| 680nm | 48.1% | 44.6% |
| 700nm | 48.2% | 44.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 48.2%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Dark cream to slightly greenish cream
Internal Reflections:
None
Pleochroism:
Weak
Comments:
Dark cream to slightly greenish cream
Chemistry of Roterbärite
Mindat Formula:
PdBiCuSe3
Elements listed:
Common Impurities:
S
Crystallography of Roterbärite
Crystal System:
Orthorhombic
Class (H-M):
2 2 2 - Disphenoidal
Space Group:
P21 21 21
Setting:
P21 21 21
Cell Parameters:
a = 5.00 Å, b = 7.99 Å, c = 13.59 Å
Ratio:
a:b:c = 0.626 : 1 : 1.701
Unit Cell V:
542.92 ų (Calculated from Unit Cell)
Comment:
(Bi,Sb)CuNiSsub>3 structure-type
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.795 Å | (38) |
| 3.359 Å | (97) |
| 3.123 Å | (100) |
| 3.043 Å | (75) |
| 2.812 Å | (73) |
| 2.389 Å | (39) |
| 2.248 Å | (37) |
| 1.921 Å | (70) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Type Occurrence of Roterbärite
General Appearance of Type Material:
Euhedral to subhedral grains, up to 50 μm in diameter, in clausthalite.
Place of Conservation of Type Material:
In the mineralogical collections of the Geosammlung, Technische Universität Clausthal, Adolph-Roemer-Straße 2A, 38678 Clausthal-Zellerfeld, Germany.
Associated Minerals at Type Locality:
Reference:
Vymazalová, A., Cabral, A.R., Laufek, F., Ließmann, W., Stanley, C.J., Lehmann, B. (2020) Roterbärite, PdCuBiSe3, a new mineral species from the Roter Bär mine, Harz Mountains, Germany. Mineralogy and Petrology: 114: 443–451.
Synonyms of Roterbärite
Relationship of Roterbärite to other Species
Member of:
Other Members of this group:
| Lapieite | NiCuSbS3 | Orth. 2 2 2 : P21 21 21 |
| Lisiguangite | PtCuBiS3 | Orth. 2 2 2 : P21 21 21 |
| Malyshevite | PdCuBiS3 | Orth. mmm (2/m 2/m 2/m) : Pmmm |
| Mückeite | NiCu(Bi,Sb)S3 | Orth. 2 2 2 : P21 21 21 |
Related Minerals - Strunz-mindat Grouping
| 2.GA. | Arsiccioite | AgHg2Tl(As,Sb)2S6 |
| 2.GA. | Eckerite | Ag2CuAsS3 |
| 2.GA. | Pyradoketosite | Ag3SbS3 |
| 2.GA.05 | Proustite | Ag3AsS3 |
| 2.GA.05 | Pyrargyrite | Ag3SbS3 |
| 2.GA.10 | Pyrostilpnite | Ag3SbS3 |
| 2.GA.10 | Xanthoconite | Ag3AsS3 |
| 2.GA.15 | Samsonite | Ag4MnSb2S6 |
| 2.GA.20 | Skinnerite | Cu3SbS3 |
| 2.GA.20 | Wittichenite | Cu3BiS3 |
| 2.GA.20 | Bytízite | Cu3SbSe3 |
| 2.GA.25 | Lapieite | NiCuSbS3 |
| 2.GA.25 | Mückeite | NiCu(Bi,Sb)S3 |
| 2.GA.25 | Malyshevite | PdCuBiS3 |
| 2.GA.25 | Lisiguangite | PtCuBiS3 |
| 2.GA.30 | Aktashite | Cu6Hg3As4S12 |
| 2.GA.30 | Gruzdevite | Cu6Hg3Sb4S12 |
| 2.GA.30 | Nowackiite | Cu6Zn3As4S12 |
| 2.GA.30 | Zhengminghuaite | Cu6Fe3As4S12 |
| 2.GA.35 | Laffittite | AgHgAsS3 |
| 2.GA.40 | Routhierite | Tl(Cu,Ag)(Hg,Zn)2(As,Sb)2S6 |
| 2.GA.40 | Stalderite | Tl(Cu,Ag)(Zn,Fe,Hg)2(As,Sb)2S6 |
| 2.GA.40 | Ralphcannonite | AgZn2TlAs2S6 |
| 2.GA.40 | Ferrostalderite | CuFe2TlAs2S6 |
| 2.GA.40 | Unnamed (Ag-Fe endmember of Routhierite Group) | AgFe2TlAs2S6 |
| 2.GA.45 | Erniggliite | Tl2SnAs2S6 |
| 2.GA.50 | Bournonite | PbCuSbS3 |
| 2.GA.50 | Seligmannite | PbCuAsS3 |
| 2.GA.50 | Součekite | PbCuBi(S,Se)3 |
| 2.GA.50 | Unnamed (Pb-Cu-Bi Selenide) | PbCuBiSe3 |
| 2.GA.50 | Cerromojonite | CuPbBiSe3 |
| 2.GA.55 | Eldragónite | Cu6BiSe4(Se2) |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Roterbärite
mindat.org URL:
https://www.mindat.org/min-53743.html
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References for Roterbärite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 51. European Journal of Mineralogy, 31 (5-6) 1099-1104 doi:10.1127/ejm/2019/0031-2894
www.tu-clausthal.de (2020) https://www.tu-clausthal.de/universitaet/einrichtungen/presse-und-oeffentlichkeitsarbeit/pressemitteilungen/artikel/clausthaler-entdecken-neues-mineral-im-harz
Localities for Roterbärite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Germany (TL) | |
| Cabral et al. (2015) +4 other references |
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Roter Bär Mine, St Andreasberg, Braunlage, Goslar District, Lower Saxony, Germany