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Bornhardtite

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Formula:
Co
2+
 
Co
3+
2
Se
 
4
System:IsometricColour:Rose-red
Hardness:4
Member of:Linnaeite Group > Thiospinel Group
Name:For Dr. Wilhelm Bornhardt (1864-?), German


Linnaeite Group and Thiospinel Group, Se analogue of Linnaeite
A mineral that appears to never have been analyzed! Perhaps = Tyrrellite.

Classification of Bornhardtite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.01-120
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:2.10.1.5

2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4
Hey's CIM Ref.: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
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Type Occurrence of Bornhardtite

Type Locality:Trogtal Quarries, Lautenthal, Harz Mts, Lower Saxony, Germany
Year of Discovery:1955

Occurrences of Bornhardtite

Geological Setting:Hydrothermal

Physical Properties of Bornhardtite

Diaphaneity (Transparency):Opaque
Colour:Rose-red
Hardness (Mohs):4
Density (calculated):6.166 g/cm3

Crystallography of Bornhardtite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fd3m {F41/d 3 2/m}
Space Group Setting:Fd3m
Cell Parameters:a = 10.2Å
Unit Cell Volume:V 1,061.21 ų (Calculated from Unit Cell)
Z:8
Morphology:Massive

Chemical Properties of Bornhardtite

Formula:
Co
2+
 
Co
3+
2
Se
 
4
Essential elements:Co, Se
All elements listed in formula:Co, Se

Relationship of Bornhardtite to other Species

Member of:Linnaeite Group > Thiospinel Group
Other Members of Group:

- +
Cadmoindite
CdIn
 
2
S
 
4
Carrollite
Cu(Co,Ni)
 
2
S
 
4
Cuproiridsite
(Cu,Fe)Ir
 
2
S
 
4
Cuprorhodsite
(Cu,Fe)Rh
 
2
S
 
4
Daubréelite
Fe
2+
 
Cr
3+
2
S
 
4
Ferrorhodsite
(Fe,Cu)(Rh,Ir,Pt)
 
2
S
 
4
Fletcherite
Cu(Ni,Co)
 
2
S
 
4
Florensovite
(Cu,Zn)Cr
 
1.5
Sb
 
0.5
S
 
4
Greigite
Fe
2+
 
Fe
3+
2
S
 
4
Indite
FeIn
 
2
S
 
4
Kalininite
ZnCr
 
2
S
 
4
Linnaeite
Co
2+
 
Co
3+
2
S
 
4
Malanite
Cu(Pt
3+
 
,Ir
3+
 
)
 
2
S
 
4
Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
Siegenite
CoNi
 
2
S
 
4
 -NiCo
 
2
S
 
4
Trüstedtite
Ni
 
3
Se
 
4
Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
Violarite
Fe
2+
 
Ni
3+
2
S
 
4
Xingzhongite
(Pb,Cu,Fe)(Ir,Pt,Rh)
 
2
S
 
4
Related Minerals - Nickel-Strunz Grouping):

- +
2.DA.05Carrollite
Cu(Co,Ni)
 
2
S
 
4
2.DA.05Cuproiridsite
(Cu,Fe)Ir
 
2
S
 
4
2.DA.05Cuprorhodsite
(Cu,Fe)Rh
 
2
S
 
4
2.DA.05Daubréelite
Fe
2+
 
Cr
3+
2
S
 
4
2.DA.05Fletcherite
Cu(Ni,Co)
 
2
S
 
4
2.DA.05Florensovite
(Cu,Zn)Cr
 
1.5
Sb
 
0.5
S
 
4
2.DA.05Greigite
Fe
2+
 
Fe
3+
2
S
 
4
2.DA.05Indite
FeIn
 
2
S
 
4
2.DA.05Kalininite
ZnCr
 
2
S
 
4
2.DA.05Linnaeite
Co
2+
 
Co
3+
2
S
 
4
2.DA.05Malanite
Cu(Pt
3+
 
,Ir
3+
 
)
 
2
S
 
4
2.DA.05Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
2.DA.05Siegenite
CoNi
 
2
S
 
4
 -NiCo
 
2
S
 
4
2.DA.05Trüstedtite
Ni
 
3
Se
 
4
2.DA.05Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
2.DA.05Violarite
Fe
2+
 
Ni
3+
2
S
 
4
2.DA.05Xingzhongite
(Pb,Cu,Fe)(Ir,Pt,Rh)
 
2
S
 
4
2.DA.05Ferrorhodsite
(Fe,Cu)(Rh,Ir,Pt)
 
2
S
 
4
2.DA.05Cadmoindite
CdIn
 
2
S
 
4
2.DA.05Cuprokalininite
CuCr
 
2
S
 
4
2.DA.10Rhodostannite
Cu
 
2
FeSn
 
3
S
 
8
2.DA.10Toyohaite
Ag
 
2
FeSn
 
3
S
 
8
2.DA.15Brezinaite
Cr
 
3
S
 
4
2.DA.15Heideite
(Fe,Cr)
 
1.15
(Ti,Fe)
 
2
S
 
4
2.DA.20Inaglyite
Cu
 
3
Pb(Ir,Pt)
 
8
S
 
16
2.DA.20Konderite
Cu
 
3
Pb(Rh,Pt,Ir)
 
8
S
 
16
2.DA.25Kingstonite
(Rh,Ir,Pt)
 
3
S
 
4
Related Minerals - Hey's Index Grouping:

- +
3.10.1Cobaltpentlandite
(Co,Ni,Fe)
 
9
S
 
8
3.10.2Linnaeite
Co
2+
 
Co
3+
2
S
 
4
3.10.3Cattierite
CoS
 
2
3.10.4Freboldite
CoSe
3.10.6Trogtalite
CoSe
 
2
3.10.7Hastite
3.10.8Mattagamite
CoTe
 
2
3.10.9Modderite
(Co,Fe)As
3.10.10Safflorite
(Co,Fe,Ni)As
 
2
3.10.11Clinosafflorite
(Co,Fe,Ni)As
 
2
3.10.12Skutterudite
(Co,Fe,Ni)As
 
2-3
3.10.13Cobaltite
CoAsS
3.10.14Paracostibite
CoSbS
3.10.15Costibite
CoSbS
3.10.16Alloclasite
Co
 
1-x
Fe
 
x
AsS
3.10.17Glaucodot
(Co
 
0.50
Fe
 
0.50
)AsS
3.10.18Carrollite
Cu(Co,Ni)
 
2
S
 
4

Other Names for Bornhardtite

Other Languages:
German:Bornhardtit
Russian:Борнхардтит
Spanish:Bornhardtita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Bornhardtite

Reference List:

- +
Ramdohr, P. (1955): Neues Jahrb. Monatsh. Mineral., 133-142.

American Mineralogist: 41: 164.

Internet Links for Bornhardtite

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  • Bornhardtite details from Handbook of Mineralogy (PDF)
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    • Localities for Bornhardtite

    The 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.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Lower Saxony
      • Harz Mts
        • Clausthal-Zellerfeld
          • Lerbach
    		Weiss: "Mineralfundstellen, Deutschland West", 1990
        • Lautenthal
    		Am. Mineral. (1956) 41, 164-165; Neues Jahrb. Mineral., Monatsh. (1955) 133–142; Weiss: "Mineralfundstellen, Deutschland West", 1990
    • Saxony-Anhalt
      • Harz Mts
    		Wittern: "Mineralfundorte in Deutschland", 2001
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 6th Jul 2011 06:21:16
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