Tennantite-(Cd)
A valid IMA mineral species
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Formula:
Cu6(Cu4Cd2)As4S12S
Colour:
Black
Lustre:
Metallic
Hardness:
3½ - 4
Specific Gravity:
4.724 (Calculated)
Crystal System:
Isometric
Member of:
Name:
Named according to tetrahedrite group nomenclature, as the cadmium dominant member of the tennantite subgroup.
Unique combination of elements (at the upload time).
Unique Identifiers
Mindat ID:
55756
Long-form identifier:
mindat:1:1:55756:8
GUID
(UUID V4):
(UUID V4):
9e029b3a-e69d-4546-af89-d86654048ea6
IMA Classification of Tennantite-(Cd)
Classification of Tennantite-(Cd)
2.GB.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
B : Neso-sulfarsenites, etc. with additional S
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
B : Neso-sulfarsenites, etc. with 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 |
---|---|---|
Tnt-Cd | 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 Tennantite-(Cd)
Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Reddish-brown
Hardness:
3½ - 4 on Mohs scale
Hardness Data:
Could not be measured
Comment:
Hardness by analogy to other tetrahedrite group members.
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Fracture:
Conchoidal
Density:
4.724 g/cm3 (Calculated)
Optical Data of Tennantite-(Cd)
Reflectivity:
Wavelength | R |
---|---|
400nm | 30.9% |
420nm | 30.6% |
440nm | 30.2% |
460nm | 30.1% |
470nm | 30.0% |
480nm | 30.0% |
500nm | 30.1% |
520nm | 30.3% |
540nm | 30.2% |
546nm | 30.1% |
560nm | 29.6% |
580nm | 28.7% |
589nm | 28.2% |
600nm | 27.7% |
620nm | 26.8% |
640nm | 26.1% |
650nm | 25.8% |
660nm | 25.6% |
680nm | 25.0% |
700nm | 24.6% |
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 30.9%.
Colour in reflected light:
Grey, with brownish tints.
Internal Reflections:
Very rare, with a brownish-red colour.
Chemistry of Tennantite-(Cd)
Mindat Formula:
Cu6(Cu4Cd2)As4S12S
Elements listed:
Crystallography of Tennantite-(Cd)
Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
I4 3m
Cell Parameters:
a = 10.3088(2) Å
Unit Cell V:
1,095.53 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.206 Å | (7) |
2.973 Å | (100) |
2.574 Å | (12) |
2.428 Å | (4) |
2.019 Å | (3) |
1.881 Å | (5) |
1.821 Å | (27) |
1.553 Å | (8) |
Comments:
Berenguela mining district, Bolivia. Data from the type description.
Type Occurrence of Tennantite-(Cd)
General Appearance of Type Material:
Anhedral grains, up to 1 × 1 mm.
Place of Conservation of Type Material:
Collections of (1) the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18–2, Moscow 119071, Russia, registration number 5755/1 (holotype), and (2) the Department of Mineralogy and Petrology, National Museum of Prague, Cirkusová 1740, 19300 Prague 9, Czech Republic, registration number P1P 47/2021 (cotype).
Geological Setting of Type Material:
Sediment- and volcanic-hosted veins that were exploited during
Spanish colonial times.
Associated Minerals at Type Locality:
Synonyms of Tennantite-(Cd)
Relationship of Tennantite-(Cd) to other Species
Member of:
Other Members of this group:
Tennantite-(Cu) | Cu6(Cu4Cu2)As4S12S | Iso. 4 3m : I4 3m |
Tennantite-(Fe) | Cu6(Cu4Fe2+2)As4S12S | Iso. 4 3m : I4 3m |
Tennantite-(Hg) | Cu6(Cu4Hg2)As4S12S | Iso. 4 3m : I4 3m |
Tennantite-(Mn) | Cu6(Cu4Mn2)As4S12S | Iso. 4 3m : I4 3m |
Tennantite-(Ni) | Cu6(Cu4Ni2)As4S12S | Iso. 4 3m : I4 3m |
Tennantite-(Zn) | Cu6(Cu4Zn2)As4S12S | Iso. 4 3m : I4 3m |
Related Minerals - Strunz-mindat Grouping
2.GB. | Polybasite-Tac | |
2.GB. | Argentotetrahedrite-(Hg) | Ag6(Cu4Hg2)Sb4S12S |
2.GB. | Hakite-(Zn) | Cu6(Cu4Zn2)Sb4Se12Se |
2.GB. | Hakite-(Cd) | Cu6(Cu4Cd2)Sb4Se12Se |
2.GB. | Argentotetrahedrite-(Zn) | Ag6(Cu4Zn2)Sb4S12S |
2.GB. | Pošepnýite | (Cu+3◻3)(Hg2+4Cu+2)Sb4Se12(Se0.5◻0.5) |
2.GB. | Argentopearceite | Ag16As2S11 |
2.GB. | Zvěstovite-(Zn) | Ag6(Ag4Zn2)As4S12S |
2.GB. | Kenoargentotennantite-(Fe) | [Ag6]4+(Cu4Fe2)As4S12◻ |
2.GB. | Tennantite-(Hg) | Cu6(Cu4Hg2)As4S12S |
2.GB. | Kenoargentotetrahedrite-(Zn) | [Ag6]4+(Cu4Zn2)Sb4S12◻ |
2.GB. | Tennantite-(Cu) | Cu6(Cu4Cu2)As4S12S |
2.GB. | Stibiogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)S12S |
2.GB. | Tennantite-(Ni) | Cu6(Cu4Ni2)As4S12S |
2.GB. | Tetrahedrite-(Ni) | Cu6(Cu4Ni2)Sb4S12S |
2.GB. | Stibioústalečite | (Cu4Cu2)(Cu4Cu+2)(Sb2Te2)Se12Se |
2.GB. | Arsenogoldfieldite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)S12S |
2.GB. | Tennantite-(In) | Cu6(Cu4(In3+Cu+))As4S12S |
2.GB. | Tetrahedrite-(Mn) | Cu6(Cu4Mn2)Sb4S12S |
2.GB. | Argentopolybasite | [Ag6Sb2S7][Ag9AgS4] |
2.GB.X | Kenorozhdestvenskayaite-(Fe) | [Ag6]4+(Ag4Fe2+2)Sb4S12◻ |
2.GB. | Argentotetrahedrite-(Cd) | Ag6(Cu4Cd2)Sb4S12S |
2.GB. | Tennantite-(Mn) | Cu6(Cu4Mn2)As4S12S |
2.GB. | Zvěstovite-(Fe) | Ag6(Ag4Fe2+2)As4S12S |
2.GB. | Hakite-(Fe) | Cu6(Cu4Fe2+2)Sb4Se12Se |
2.GB. | Tetrahedrite-(Cu) | Cu6(Cu4Cu2+2)Sb4S12S |
2.GB. | Arsenoústalečite | (Cu4Cu2)(Cu4Cu+2)(As2Te2)Se12Se |
2.GB. | Tetrahedrite-(Cd) | Cu6(Cu4Cd2)Sb4S12S |
2.GB.05 | Argentotennantite-(Zn) | Ag6(Cu4Zn2)As4S12S |
2.GB.05 | Freibergite Subgroup | (Ag6,[Ag6]4+)(Cu4 C2+2)Sb4S12S0-1 |
2.GB.05 | Giraudite-(Zn) | Cu6(Cu4Zn2)As4Se12Se |
2.GB.05 | Goldfieldite | (Cu4◻2)(Cu4Cu+2)Te4S12S |
2.GB.05 | Hakite-(Hg) | Cu6(Cu4Hg2)Sb4Se12Se |
2.GB.05 | Tennantite Subgroup | Cu6(Cu4C2+2)As4S12S |
2.GB.05 | Tetrahedrite Subgroup | Cu6(Cu4C2+2)Sb4S12S |
2.GB.05 | Argentotetrahedrite-(Fe) | Ag6(Cu4Fe2)Sb4S12S |
2.GB.05 | Rozhdestvenskayaite-(Zn) | Ag6(Ag4Zn2)Sb4S12S |
2.GB.05 | UM1992-21-S:AgFeSb | Ag6(Ag4Fe2+2)Sb4S12S |
2.GB.05 | Tennantite-(Zn) | Cu6(Cu4Zn2)As4S12S |
2.GB.05 | Tetrahedrite-(Zn) | Cu6(Cu4Zn2)Sb4S12S |
2.GB.05 | Tennantite-(Fe) | Cu6(Cu4Fe2+2)As4S12S |
2.GB.05 | Tetrahedrite-(Fe) | Cu6(Cu4Fe2+2)Sb4S12S |
2.GB.05 | Kenoargentotetrahedrite-(Fe) | [Ag6]4+(Cu4Fe2+2)Sb4S12◻ |
2.GB.05 | Tetrahedrite-(Hg) | Cu6(Cu4Hg2)Sb4S12S |
2.GB.10 | Selenostephanite | Ag5SbSe4 |
2.GB.10 | Stephanite | Ag5SbS4 |
2.GB.15 | Pearceite | [Ag6As2S7][Ag9CuS4] |
2.GB.15 | Polybasite | [Ag6Sb2S7][Ag9CuS4] |
2.GB.15 | UM2003-14-S:AgBiFeTe | Ag16FeBiTe3S8 |
2.GB.15 | Selenopolybasite | [(Ag,Cu)6(Sb,As)2(S,Se)7][Ag9Cu(S,Se)2Se2] |
2.GB.15 | Cupropearceite | [Cu6As2S7][Ag9CuS4] |
2.GB.15 | Cupropolybasite | [Cu6Sb2S7][Ag9CuS4] |
2.GB.15 | UM1979-17-S:BiCuFe | ~Cu18Fe4BiS16 |
2.GB.20 | Galkhaite | (Hg5Cu)CsAs4S12 |
2.GB.20 | Vorontsovite | (Hg5Cu)Σ6TlAs4S12 |
2.GB.20 | Ferrovorontsovite | (Fe5Cu)Σ6TlAs4S12 |
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 Tennantite-(Cd)
mindat.org URL:
https://www.mindat.org/min-55756.html
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References for Tennantite-(Cd)
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2022) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 65. European Journal of Mineralogy, 34 (1) 143-148 doi:10.5194/ejm-34-143-2022
Localities for Tennantite-(Cd)
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Bolivia (TL) | |
| Miyawaki et al. (2022) +1 other reference |