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About HotsoniteHide

Al11(SO4)3(PO4)2(OH)21 · 16H2O
Specific Gravity:
2.06 - 2.07
Crystal System:
For the locality.
White, chalk-like incrustations.

Classification of HotsoniteHide

Approval Year:

D : Phosphates, etc. with additional anions, with H2O
F : With only medium-sized cations, (OH,etc.):RO4 > 3:1

5 : Hydrated Compound Phosphates, etc·, Containing Hydroxyl or Halogen

22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates

Physical Properties of HotsoniteHide

2½ on Mohs scale
2.06 - 2.07 g/cm3 (Measured)    

Optical Data of HotsoniteHide

RI values:
nα = 1.519 nγ = 1.521
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of HotsoniteHide

Al11(SO4)3(PO4)2(OH)21 · 16H2O
IMA Formula:
Al5(SO4)(PO4)(OH)10 · 8H2O

Crystallography of HotsoniteHide

Crystal System:
Lathlike or acicular, up to 15 μm in length.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
10.05 Å(100)
8.45 Å(40)
5.20 Å(10)
5.01 Å(10)
4.63 Å(20)
4.43 Å(10)
3.67 Å(10)

Type Occurrence of HotsoniteHide

Place of Conservation of Type Material:
National Museum, Bloemfontein, South Africa (specimen K22359)
Geological Setting of Type Material:
Weathered sillimanite deposit. The sillimanite ore weathers to natroalunite and zaherite, which is then weathered to hotsonite.

Synonyms of HotsoniteHide

Other Language Names for HotsoniteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
2 photos of Hotsonite associated with NatroaluniteNaAl3(SO4)2(OH)6
1 photo of Hotsonite associated with SillimaniteAl2(SiO4)O

Related Minerals - Nickel-Strunz GroupingHide

8.DF.10BolivariteAl2(PO4)(OH)3 · 4-5H2OAmor.
8.DF.10EvansiteAl3(PO4)(OH)6 · 6H2OAmor.
8.DF.10Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2OOrth.
8.DF.10Rosièresite(Pb, Cu, Al, P, O, H)Amor.
8.DF.15Rusakovite(Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O
8.DF.20LiroconiteCu2Al(AsO4)(OH)4 · 4H2OMon. 2/m
8.DF.25SieleckiiteCu3Al4(PO4)2(OH)12 · 2H2OMon. 2/m : B2/m
8.DF.30ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
8.DF.35ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

22.3.1ParnauiteCu9(AsO4)2(SO4)(OH)10 · 7H2OOrth. mm2 : Pmn21
22.3.2ArdealiteCa2(PO3OH)(SO4) · 4H2OMon. m : Bb
22.3.3Machatschkiite(Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2OHex.
22.3.4ClinotyroliteCa2Cu9(AsO4,SO4)4(OH,O)10 · 10H2OMon.
22.3.5PeisleyiteNa2Al9[(P,S)O4]8(OH)6•28H2OTric. 1 : P1
22.3.6ChalcophylliteCu18Al2(AsO4)4(SO4)3(OH)24 · 36H2OTrig. 3 : R3
22.3.7WoodhouseiteCaAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.9SvanbergiteSrAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.11SanjuaniteAl2(PO4)(SO4)(OH) · 9H2OTric.
22.3.12KribergiteAl5(PO4)3(SO4)(OH)4 · 4H2OTric. 1 : P1
22.3.15TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.16ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
22.3.17HinsdalitePbAl3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.20CoconinoiteFe3+2Al2(UO2)2(PO4)4(SO4)(OH)2 · 20H2OMon.
22.3.21Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
22.3.22Tristramite(Ca,U,Fe)(PO4,SO4) · 2H2OHex.
22.3.23CorkitePbFe3(PO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.24BeudantitePbFe3(AsO4)(SO4)(OH)6Trig. 3m (3 2/m) : R3m
22.3.25DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
22.3.26SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
22.3.27BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
22.3.28ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth. 2 2 2 : P2 2 2
22.3.29TooeleiteFe3+6(As3+O3)4(SO4)(OH)4 · 4H2OMon. 2/m : B2/m
22.3.30Pitticite(Fe, AsO4, H2O) (?)Amor.
22.3.31Xiangjiangite(Fe3+,Al)(UO2)4(PO4)2(SO4)2(OH) · 22H2OTet.

Other InformationHide

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

References for HotsoniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Beukes, G. J., Schoch, A. E., Van der Westhuizen, W. A., Bok, L. D. C., de Bruiyn, H. (1984): Hotsonite, a new hydrated aluminum-phosphate-sulfate from Pofarder, South Africa. American Mineralogist 68, 979-983.
American Mineralogist: 69: 979-983.
Schoch, A. E., Beukes, G. J., Praekelt, H. E. (1985): A natroalunite - zaherite - hotsonite paragenesis from Pofadder, Bushmanland, South Africa. Canadian Mineralogist 23, 29-34.
Ivanov, O. K., Shiryaeva, L. L., Khoroshilova, L. A., Petrisheva, V. G. (1990): Hotsonite: confirmation the discovery and new data (Belyavinsky mine, the Urals). Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 119 (1), 121-126.
American Mineralogist: 76 (1991) 1734. (Abs.)

Internet Links for HotsoniteHide

Localities for HotsoniteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Hubei
    • Shiyan
      • Zhushan Co.
Zhenrong Shi, Keqin Cai, and Mingquan Gong (2008): Northwestern Geology 45(2), 56-62
  • Shaanxi
    • Ankang
      • Baihe County
Zhenrong Shi and Keqin Cai (2007): Superhard Material Engineering 18(4)
  • Chelyabinsk Oblast
Ivanov, O.K. Shiryaeva L.I., Khoroshilova L.A. & Petri-Sheva V.G. (1990): Hotsonite: confirmation of the discovery and new data (Belyavinsky mine, the Urals). Zap. Vser. Mineral. Obshchest. 119, 121-126 (in Russian).
South Africa (TL)
  • Northern Cape
    • Namakwa
      • Khâi-Ma
        • Koenabib farm (Hotson 42 farm)
Minerals of South Africa; Schoch, A.E., Beukes, G.J., Praekelt, H.E. (1985) A natroalunite - zaherite - hotsonite paragenesis from Pofadder, Bushmanland, South Africa. The Canadian Mineralogist: 23: 29-34.; G. J. Beukes, A. E. Schoch, H. de Bruiyn, W. A. van der Westhuizen and L. D. C. Bok (1984) A New Occurrence of the Hydrated Aluminium Sulphate Zaherite, from Pofadder, South Africa. Mineralogical Magazine: 48: 131-135.
Natural History Museum Vienna collection
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