Bornhardtite (original) (raw)
A valid IMA mineral species - grandfathered
Specific Gravity:
6.166 (Calculated)
Name:
For Dr. Friedrich Wilhelm Conrad Eduard Bornhardt (20 April 1864 Braunschweig - 2 December 1946 Goslar), German geologist, engineer and explorer, and was Director of the Berlin College of Mines (Bergakademie) from 1907 to 1916.
Se analogue of Linnaeite.
Current status "grandfathered" but considered questionable by Bosi et al. (2019).
A mineral that appears to never have been analyzed; compare tyrrellite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:726:7
77d92722-49dd-44a1-b8ac-7af777532da9
IMA Classification of BornhardtiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of BornhardtiteHide
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2.DA.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4
2.10.1.5
2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4
3.10.5
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
10 : Sulphides etc. of Co
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Bhd | 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 BornhardtiteHide
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Density:
6.166 g/cm3 (Calculated)
Optical Data of BornhardtiteHide
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Reflectivity:
| Wavelength | R |
|---|---|
| 400nm | 41.3% |
| 420nm | 42.8% |
| 440nm | 44.3% |
| 460nm | 45.4% |
| 480nm | 46.4% |
| 500nm | 47.2% |
| 520nm | 47.8% |
| 540nm | 48.4% |
| 560nm | 49.2% |
| 580nm | 49.2% |
| 600nm | 49.7% |
| 620nm | 50.2% |
| 640nm | 50.8% |
| 660nm | 51.4% |
| 680nm | 52.0% |
| 700nm | 52.7% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 52.7%.
Chemistry of BornhardtiteHide
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Mindat Formula:
Co2+Co3+2Se4
Crystallography of BornhardtiteHide
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Class (H-M):
m_3_m _(_4/_m_32/m ) - Hexoctahedral
Cell Parameters:
a = 10.2(2) Å
Unit Cell V:
1,061.21 ų (Calculated from Unit Cell)
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.7 Å | (100) |
| 2.4 Å | (100) |
| 2.3 Å | (100) |
| 2.2 Å | (100) |
| 2.0 Å | (100) |
| 1.96 Å | (100) |
| 1.42 Å | (100) |
Comments:
Trogtal quarry, Germany.
Geological EnvironmentHide
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Geological Setting:
Hydrothermal
Type Occurrence of BornhardtiteHide
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General Appearance of Type Material:
Fine violet to red-brown intergrowths in clausthalite.
Place of Conservation of Type Material:
Associated Minerals at Type Locality:
Reference:
Ramdohr, P., Schmitt, M. (1955) Vier neue natürliche Kobaltselenide vom Steinbruch Trogtal bei Laufenthal im Harz. Neues Jahrbuch für Mineralogie, Monatshefte: 1955: 133-142.
Other Language Names for BornhardtiteHide
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Relationship of Bornhardtite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 2.DA. | Zaykovite | Rh3Se4 | Mon. 2/m : _B_2/m |
|---|---|---|---|
| 2.DA. | Grimmite | NiCo2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA. | Zolenskyite | FeCr2S4 | Mon. 2/m : _B_2/m |
| 2.DA. | Ezochiite | Cu+(Rh3+Pt4+)S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA. | Ferrodimolybdenite | FeMo2S4 | Mon. 2/m : _B_2/b |
| 2.DA.05 | Carrollite | CuCo2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Cuproiridsite | (Cu,Fe)Ir2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Cuprorhodsite | (Cu1+0.5Fe3+0.5)Rh3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Daubréelite | Fe2+Cr3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Fletcherite | CuNi2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Florensovite | (Cu,Zn)Cr1.5Sb0.5S4 | Iso. m_3_m _(_4/_m_32/m ) |
| 2.DA.05 | Greigite | Fe2+Fe3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Indite | FeIn2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Kalininite | ZnCr2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Linnaeite | Co2+Co3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Malanite | Cu1+(Ir3+Pt4+)S4 | Iso. m_3_m _(_4/_m_32/m ) |
| 2.DA.05 | Polydymite | Ni2+Ni3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Siegenite | CoNi2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Trüstedtite | Ni3Se4 | Iso. |
| 2.DA.05 | Tyrrellite | Cu(Co,Ni)2Se4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Violarite | Fe2+Ni3+2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Xingzhongite | Pb2+Ir3+2S4 | Iso. |
| 2.DA.05 | Cadmoindite | CdIn2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Cuprokalininite | CuCr2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Joegoldsteinite | MnCr2S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Nickeltyrrellite | CuNi2Se4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Shiranuiite | Cu+(Rh3+Rh4+)S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.05 | Berndlehmannite | Cu(CrV)S4 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 2.DA.10 | Rhodostannite | Cu1+(Fe2+0.5Sn4+1.5)S4 | Tet. 4/m : _I_41/a |
| 2.DA.10 | Toyohaite | Ag1+(Fe2+0.5Sn4+1.5)S4 | Tet. 4/m : _I_41/a |
| 2.DA.15 | Brezinaite | Cr3S4 | Mon. 2/m |
| 2.DA.15 | Heideite | (Fe,Cr)1.15(Ti,Fe)2S4 | Mon. 2/m |
| 2.DA.20 | Inaglyite | Cu3Pb(Ir,Pt)8S16 | Hex. |
| 2.DA.20 | Konderite | Cu3Pb(Rh,Pt,Ir)8S16 | Hex. 6/m : _P_6/m |
| 2.DA.25 | Kingstonite | (Rh,Ir,Pt)3S4 | Mon. 2/m : _B_2/m |
Other InformationHide
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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 BornhardtiteHide
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References for BornhardtiteHide
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Localities for BornhardtiteHide
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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
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