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Zaherite

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Formula:
Al12(SO4)5(OH)26 · 20H2O
Colour:
White to blue-green
Lustre:
Pearly
Hardness:
Crystal System:
Triclinic
Name:
Named in 1977 by A. P. Ruotsala and L. L. Babcock in honour of Mohammed Abduz Zaher (1935-), geologist, Geological Survey of Bangladesh.
Dehydrates reversibly at room temperature.


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Classification of ZaheriteHide

Approved
Approval Year:
1977
7.DE.65

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
31.10.3.1

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
10 : Miscellaneous
25.6.11

25 : Sulphates
6 : Sulphates of Al and Tl

Physical Properties of ZaheriteHide

Pearly
Transparency:
Translucent
Colour:
White to blue-green
Hardness:
3½ on Mohs scale

Optical Data of ZaheriteHide

Type:
Biaxial (+)
RI values:
nα = 1.498 nβ = 1.498 nγ = 1.499
2V:
Calculated: 38°
Max Birefringence:
δ = 0.001
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
very weak

Chemical Properties of ZaheriteHide

Formula:
Al12(SO4)5(OH)26 · 20H2O

Crystallography of ZaheriteHide

Crystal System:
Triclinic
Cell Parameters:
a = 18.47 Å, b = 19.45 Å, c = 3.77 Å
α = 95.24°, β = 91.48°, γ = 80.24°
Ratio:
a:b:c = 0.95 : 1 : 0.194
Unit Cell V:
1,329.09 ų (Calculated from Unit Cell)

Type Occurrence of ZaheriteHide

Synonyms of ZaheriteHide

Other Language Names for ZaheriteHide

German:Zaherit
Spanish:Zaherita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Sillimanite1 photo of Zaherite associated with Sillimanite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.DE.05MangazeiteAl2(SO4)(OH)4 · 3H2OTric.
7.DE.10CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2OOrth.
7.DE.10CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2OOrth.
7.DE.10UKI-1975-(SO:AlCu)(Cu, Al, SO4, H2O)
7.DE.15SchwertmanniteFe3+16(OH,SO4)12-13O16 · 10-12H2OTet.
7.DE.20TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2OOrth.
7.DE.25UtahiteCu5Zn3(TeO4)4(OH)8 · 7H2OTric.
7.DE.35CoquanditeSb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)Tric. 1 : P1
7.DE.40OsakaiteZn4(SO4)(OH)6 · 5H2OTric. 1 : P1
7.DE.45WilcoxiteMgAl(SO4)2F · 17H2OTric. 1 : P1
7.DE.50Stanleyite(V4+O)(SO4) · 6H2OOrth.
7.DE.55McalpineiteCu3(Te6+O6)Iso. m3 (2/m 3) : Ia3
7.DE.60HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2OMon.
7.DE.62VolaschioiteFe4(SO4)O2(OH)6 · 2H2OMon. 2/m : B2/m
7.DE.70LautenthalitePbCu4(SO4)2(OH)6 · 3H2OMon. 2/m : P21/b
7.DE.75CamérolaiteCu6Al3(OH)18(H2O)2[Sb(OH)6](SO4)Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

25.6.1RostiteAl(SO4)(OH) · 5H2OOrth. mmm (2/m 2/m 2/m)
25.6.2JurbaniteAl(SO4)(OH) · 5H2OMon.
25.6.3KhademiteAl(SO4)F · 5H2OOrth. mmm (2/m 2/m 2/m)
25.6.4Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
25.6.5AluminiteAl2(SO4)(OH)4 · 7H2OMon. 2/m : P21/b
25.6.6Meta-alunogenAl2(SO4)3 · 12H2O
25.6.7AlunogenAl2(SO4)3 · 17H2OTric. 1
25.6.8FelsőbányaiteAl4(SO4)(OH)10 · 4H2OMon. 2 : P21
25.6.9BasaluminiteAl4(SO4)(OH)10 · 4H2OHex.
25.6.10HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2OMon.
25.6.12TamarugiteNaAl(SO4)2 · 6H2OMon. 2/m
25.6.13MendoziteNaAl(SO4)2 · 11H2OMon. 2/m
25.6.14Alum-(Na)NaAl(SO4)2 · 12H2O
25.6.15NatroaluniteNaAl3(SO4)2(OH)6Trig. 3m : R3m
25.6.16KaliniteKAl(SO4)2 · 11H2OMon. 2/m : B2/b
25.6.17Alum-(K)KAl(SO4)2 · 12H2OIso. m3 (2/m 3)
25.6.18AluniteKAl3(SO4)2(OH)6Trig. 3m : R3m
25.6.19Natroalunite-2c(Na,Ca0.5,K)Al3(SO4)2(OH)6Trig. 3m (3 2/m) : R3m
25.6.20Tschermigite(NH4)Al(SO4)2 · 12H2OIso. m3 (2/m 3) : Pa3

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 ZaheriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1977): 62: 1125-1128.
Mineralogical Magazine (1985): 49: 145-146.
American Mineralogist (1986): 71: 231-232.

Internet Links for ZaheriteHide

Localities for ZaheriteHide

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.
Italy
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
            • Porto Levante
              • Faraglioni di Levante (Grotte dei Faraglioni; Grotte del Faraglione; "Grotte de Faraglione")
                • Faraglione Nico (Faraglione Piccolo; Faragghiune Nicu)
P.Forti, M.Panzica La Manna and A.Rossi (1994) The peculiar mineralogic site of the Alum cave (Vulcano, Sicily). Proceedings of the 7th International Symposium on Vulcanospeleology November 1994 p.35-44.
Pakistan (TL)
 
  • Punjab
[Amer.Min.(1977) 62, 1125-1128; MinRec 9:115]
South Africa
 
  • Northern Cape Province
    • Bushmanland
      • Koenabib farm (Hotson 42 farm)
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
Mineral and/or Locality  
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