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Speelmanskop Farm 571, Cradock, Chris Hani District, Eastern Cape, South Africai
Regional Level Types
Speelmanskop Farm 571Farm
Cradock- not defined -
Chris Hani DistrictDistrict
Eastern CapeProvince
South AfricaCountry

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Key
Lock Map
Latitude & Longitude (WGS84): 31° 53' 50'' South , 25° 35' 10'' East
Latitude & Longitude (decimal): -31.89722,25.58611
GeoHash:G#: kd64w1r1p
Locality type:Farm
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Graphite containing nodules and sulphide-arsenide mineralizations occurring in the contact zone between Karoo dolerite and the top of a sheet-like granodiorite intrusion.
Located about 30 km north of Cradock.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


14 valid minerals.

Detailed Mineral List:

Chalcopyrite
Formula: CuFeS2
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
'Chlorite Group'
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Clinochlore var: Ripidolite
Formula: (Mg,Fe,Al)6(Si,Al)4O10(OH)8
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Covellite
Formula: CuS
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Gersdorffite
Formula: NiAsS
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Gersdorffite var: Cobaltoan Gersdorffite
Formula: (Ni,Co)AsS
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Goethite
Formula: α-Fe3+O(OH)
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Gold
Formula: Au
Reference: Council for Geoscience, Pretoria collection.
Graphite
Formula: C
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Marcasite
Formula: FeS2
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Molybdenite
Formula: MoS2
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Nickeline
Formula: NiAs
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
'Saussurite'
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Sphalerite
Formula: ZnS
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.
Talnakhite ?
Formula: Cu9(Fe,Ni)8S16
Reference: Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Mineralium Deposita 32, 410-418.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Graphite1.CB.05aC
Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Gersdorffite2.EB.25NiAsS
var: Cobaltoan Gersdorffite2.EB.25(Ni,Co)AsS
Marcasite2.EB.10aFeS2
Molybdenite2.EA.30MoS2
Nickeline2.CC.05NiAs
Sphalerite2.CB.05aZnS
Talnakhite ?2.CB.10bCu9(Fe,Ni)8S16
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Group 9 - Silicates
'Clinochlore'9.EC.55Mg5Al(AlSi3O10)(OH)8
var: Ripidolite9.EC.55(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
Saussurite-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Nickeline2.8.11.1NiAs
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
Talnakhite ?2.9.8.1Cu9(Fe,Ni)8S16
AmBnXp, with (m+n):p = 1:2
Gersdorffite2.12.3.2NiAsS
Marcasite2.12.2.1FeS2
Molybdenite2.12.10.1MoS2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
Clinochlore
var: Ripidolite
-(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Gersdorffite
var: Cobaltoan Gersdorffite
-(Ni,Co)AsS
Kaolinite-Al2(Si2O5)(OH)4
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Saussurite'-

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Goethiteα-Fe3+O(OH)
H KaoliniteAl2(Si2O5)(OH)4
H MuscoviteKAl2(AlSi3O10)(OH)2
H Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CCarbon
C GraphiteC
OOxygen
O ClinochloreMg5Al(AlSi3O10)(OH)8
O Goethiteα-Fe3+O(OH)
O KaoliniteAl2(Si2O5)(OH)4
O MuscoviteKAl2(AlSi3O10)(OH)2
O Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al KaoliniteAl2(Si2O5)(OH)4
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SiSilicon
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si KaoliniteAl2(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
SSulfur
S ChalcopyriteCuFeS2
S Gersdorffite (var: Cobaltoan Gersdorffite)(Ni,Co)AsS
S CovelliteCuS
S GersdorffiteNiAsS
S MarcasiteFeS2
S MolybdeniteMoS2
S SphaleriteZnS
S TalnakhiteCu9(Fe,Ni)8S16
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe MarcasiteFeS2
Fe Clinochlore (var: Ripidolite)(Mg,Fe,Al)6(Si,Al)4O10(OH)8
Fe TalnakhiteCu9(Fe,Ni)8S16
CoCobalt
Co Gersdorffite (var: Cobaltoan Gersdorffite)(Ni,Co)AsS
NiNickel
Ni Gersdorffite (var: Cobaltoan Gersdorffite)(Ni,Co)AsS
Ni GersdorffiteNiAsS
Ni NickelineNiAs
Ni TalnakhiteCu9(Fe,Ni)8S16
CuCopper
Cu ChalcopyriteCuFeS2
Cu CovelliteCuS
Cu TalnakhiteCu9(Fe,Ni)8S16
ZnZinc
Zn SphaleriteZnS
AsArsenic
As Gersdorffite (var: Cobaltoan Gersdorffite)(Ni,Co)AsS
As GersdorffiteNiAsS
As NickelineNiAs
MoMolybdenum
Mo MolybdeniteMoS2
AuGold
Au GoldAu

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Jurassic
145 - 201.3 Ma



ID: 2233430
Karoo Dolerite Suite

Age: Jurassic (145 - 201.3 Ma)

Stratigraphic Name: Karoo Dolerite Suite

Description: Network of dolerite sills, sheets and dykes, mainly intrusive into the Karoo Supergroup

Reference: Council for Geoscience. Geologic map of South Africa, 1:1M. National Science Councils of South Africa. [41]

Triassic
201.3 - 251.902 Ma



ID: 3306672

Age: Triassic (201.3 - 251.902 Ma)

Lithology: Sedimentary

Reference: Thiéblemont, D. (ed.). New edition of the 1:10,000,000 geological map of Africa. CGMW-BRGM. [190]

Triassic
201.3 - 251.902 Ma



ID: 3186759
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 Ma)

Stratigraphic Name: Karoo Supergroup

Comments: Karoo Basin

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Henning, A., van der Westhuizen, W.A., de Bruiyn, H., and Beukes, G.J. (1997): Hydrothermal Cu-Ni-Au-Ag mineralization in a granodiorite sill north of Cradock, Republic of South Africa. Mineralium Deposita 32, 410-418.


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