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Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africai
Regional Level Types
Hotson 6 MineOpen-Cast Mine
Koenabib farmFarm
Khâi-Ma Local MunicipalityMunicipality
Namakwa District MunicipalityDistrict Municipality
Northern CapeProvince
South AfricaCountry

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PhotosMapsSearch
00519240017272031083770.jpg
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
05580460017272031081708.jpg
Zaherite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
00402500017271923875968.jpg
Hotsonite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
00519240017272031083770.jpg
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
00873970017271927726660.jpg
Zaherite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
00402500017271923875968.jpg
Hotsonite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
00519240017272031083770.jpg
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
06147870017271927819296.jpg
Zaherite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
Latitude & Longitude (WGS84):
29° 7' 24'' South , 18° 28' 23'' East
Latitude & Longitude (decimal):
-29.12346,18.47312
GRN:
S20E12
Type:
Open-Cast Mine
Deposit first discovered:
1930 (approx.)
Köppen climate type:
BWh : Hot deserts climate
Mindat Locality ID:
11891
Long-form identifier:
mindat:1:2:11891:3
GUID (UUID V4):
0


An open pit sillimanite mine (35 meters deep) in the Wortel formation of the Bushmanland Group. Located 65 km west of Pofadder in the defunct district Bushmanland and 45 km north-west of the town Aggeneys. Hotson 42 farm is a portion of Wortel 42 farm. There are seven known quarries, of which five are on the Hotson farm.

The Wortel Formation consists of biotite-sillimanite schist and quartzite (Praekelt and Schoch, 1997). Amphibolite lenses occur sporadically in the Wortel Formation; these can also host the sillimanite. The latter occurs as pods and lenses in biotite-sillimanite schist ranging from a few meters to hundreds of meters in length along strike; the Hotson 6 mine exploited one of the larger lenses (Schoch et al., 1985). The sillimanite, sometimes together with corundum, has been known since the 1930s and was used for refractory purposes (Frick and Coetzee, 1974). Schoch et al. (1985) conclude that the hotsonite and associated sulfates formed by hydration and sulfidation of the sillimanite, with the sulfate derived from the oxidation of associated chalcopyrite and other sulfides (Cairncross, 2020).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


21 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Atacamite
Formula: Cu2(OH)3Cl
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Brochantite
Formula: Cu4(SO4)(OH)6
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Chalcanthite
Formula: CuSO4 · 5H2O
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Chalcopyrite
Formula: CuFeS2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Corundum
Formula: Al2O3
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Covellite
Formula: CuS
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Diaspore
Formula: AlO(OH)
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Goethite
Formula: Fe3+O(OH)
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Gypsum
Formula: CaSO4 · 2H2O
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Hotsonite (TL)
Formula: Al11(SO4)3(PO4)2(OH)21 · 16H2O
Type Locality:
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Ilmenite
Formula: Fe2+TiO3
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Natroalunite
Formula: NaAl3(SO4)2(OH)6
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Pyrite
Formula: FeS2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Pyrophyllite
Formula: Al2Si4O10(OH)2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Rutile
Formula: TiO2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Sillimanite
Formula: Al2(SiO4)O
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Topaz
Formula: Al2(SiO4)(F,OH)2
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Turquoise
Formula: CuAl6(PO4)4(OH)8 · 4H2O
Description: Occurs in the Wortel formation of the Bushmanland Group.
ⓘ Zaherite
Formula: Al12(SO4)5(OH)26 · 20H2O
Description: Occurs in the Wortel formation of the Bushmanland Group.

Gallery:

Al11(SO4)3(PO4)2(OH)21 · 16H2Oⓘ Hotsonite (TL)
trans.png
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Hotsonite

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
Al12(SO4)5(OH)26 · 20H2Oⓘ Zaherite
trans.png
Zaherite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Zaherite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa
trans.png
Zaherite, etc.

Hotson 6 Mine, Koenabib farm, Khâi-Ma Local Municipality, Namakwa District Municipality, Northern Cape, South Africa

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘCovellite2.CA.05aCuS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrite2.EB.05aFeS2
Group 3 - Halides
ⓘAtacamite3.DA.10aCu2(OH)3Cl
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.Fe3+O(OH)
ⓘCorundum4.CB.05Al2O3
ⓘIlmenite4.CB.05Fe2+TiO3
ⓘRutile4.DB.05TiO2
ⓘDiaspore4.FD.10AlO(OH)
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBrochantite7.BB.25Cu4(SO4)(OH)6
ⓘNatroalunite7.BC.10NaAl3(SO4)2(OH)6
ⓘChalcanthite7.CB.20CuSO4 · 5H2O
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘZaherite7.DE.65Al12(SO4)5(OH)26 · 20H2O
Group 8 - Phosphates, Arsenates and Vanadates
ⓘTurquoise8.DD.15CuAl6(PO4)4(OH)8 · 4H2O
ⓘHotsonite (TL)8.DF.05Al11(SO4)3(PO4)2(OH)21 · 16H2O
Group 9 - Silicates
ⓘSillimanite9.AF.05Al2(SiO4)O
ⓘTopaz9.AF.35Al2(SiO4)(F,OH)2
ⓘPyrophyllite9.EC.10Al2Si4O10(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2

List of minerals for each chemical element

HHydrogen
Hⓘ AtacamiteCu2(OH)3Cl
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ BrochantiteCu4(SO4)(OH)6
Hⓘ ChalcanthiteCuSO4 · 5H2O
Hⓘ DiasporeAlO(OH)
Hⓘ GoethiteFe3+O(OH)
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ NatroaluniteNaAl3(SO4)2(OH)6
Hⓘ PyrophylliteAl2Si4O10(OH)2
Hⓘ TopazAl2(SiO4)(F,OH)2
Hⓘ TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
Hⓘ ZaheriteAl12(SO4)5(OH)26 · 20H2O
OOxygen
Oⓘ AtacamiteCu2(OH)3Cl
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ BrochantiteCu4(SO4)(OH)6
Oⓘ ChalcanthiteCuSO4 · 5H2O
Oⓘ CorundumAl2O3
Oⓘ DiasporeAlO(OH)
Oⓘ GoethiteFe3+O(OH)
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
Oⓘ IlmeniteFe2+TiO3
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ NatroaluniteNaAl3(SO4)2(OH)6
Oⓘ PyrophylliteAl2Si4O10(OH)2
Oⓘ RutileTiO2
Oⓘ SillimaniteAl2(SiO4)O
Oⓘ TopazAl2(SiO4)(F,OH)2
Oⓘ TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
Oⓘ ZaheriteAl12(SO4)5(OH)26 · 20H2O
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ TopazAl2(SiO4)(F,OH)2
NaSodium
Naⓘ NatroaluniteNaAl3(SO4)2(OH)6
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
AlAluminium
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ CorundumAl2O3
Alⓘ DiasporeAlO(OH)
Alⓘ HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ NatroaluniteNaAl3(SO4)2(OH)6
Alⓘ PyrophylliteAl2Si4O10(OH)2
Alⓘ SillimaniteAl2(SiO4)O
Alⓘ TopazAl2(SiO4)(F,OH)2
Alⓘ TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
Alⓘ ZaheriteAl12(SO4)5(OH)26 · 20H2O
SiSilicon
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PyrophylliteAl2Si4O10(OH)2
Siⓘ SillimaniteAl2(SiO4)O
Siⓘ TopazAl2(SiO4)(F,OH)2
PPhosphorus
Pⓘ HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
Pⓘ TurquoiseCuAl6(PO4)4(OH)8 · 4H2O
SSulfur
Sⓘ BrochantiteCu4(SO4)(OH)6
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcanthiteCuSO4 · 5H2O
Sⓘ CovelliteCuS
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ HotsoniteAl11(SO4)3(PO4)2(OH)21 · 16H2O
Sⓘ NatroaluniteNaAl3(SO4)2(OH)6
Sⓘ PyriteFeS2
Sⓘ ZaheriteAl12(SO4)5(OH)26 · 20H2O
ClChlorine
Clⓘ AtacamiteCu2(OH)3Cl
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ GypsumCaSO4 · 2H2O
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ IlmeniteFe2+TiO3
Tiⓘ RutileTiO2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChalcopyriteCuFeS2
Feⓘ GoethiteFe3+O(OH)
Feⓘ IlmeniteFe2+TiO3
Feⓘ PyriteFeS2
CuCopper
Cuⓘ AtacamiteCu2(OH)3Cl
Cuⓘ BrochantiteCu4(SO4)(OH)6
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcanthiteCuSO4 · 5H2O
Cuⓘ CovelliteCuS
Cuⓘ TurquoiseCuAl6(PO4)4(OH)8 · 4H2O

Other Regions, Features and Areas containing this locality

AfricaContinent
African PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Praekelt, H. E. and A. E. Schoch, A.E. 1997. Stratigraphic synthesis of the metasediments of the Aggeneys terrane in the Namaqua Mobile Belt. South African Journal of Geology 100:85–100.
Cairncross, B. 2020. The where of mineral names: hotsonite, Hotson 6 mine, Koenabib farm (Hotson 42 farm), Khai-Ma, Namakwa, Northern Cape, South Africa. Rocks & Minerals, 95(6), 567-570.
Frick, C. and Coetzee, C.B. (1974). The mineralogy and the petrology of the sillimanite deposits west of Pofadder, Namaqualand. Transactions of the Geological Society of South Africa, 77, 169-183.
Beukes, Gerhard J., Schoch, Aylva E., Van de Westhuizen, Willem A., Bok, D. C., de Bruiyn, Hendrik (1984) Hotsonite, a new hydrated aluminum-phosphate-sulphate from Pofadder, South Africa. American Mineralogist, 69 (9-10) 979-983
Schoch, A. E., Beukes, G. J., Praekelt, H. E. (1985) A natroalunite - zaherite - hotsonite paragenesis from Pofadder, Bushmanland, South Africa. The Canadian Mineralogist, 23 (1) 29-34
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