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Zaherite

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

Classification of Zaherite

Approved 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
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First Recorded Occurrence of Zaherite

Year of Discovery:
1977

Physical Properties of Zaherite

Pearly
Diaphaneity (Transparency):
Translucent
Colour:
White to blue-green
Hardness (Mohs):

Crystallography of Zaherite

Crystal System:
Triclinic
Cell Parameters:
a = 18.47Å, b = 19.45Å, c = 3.77Å
α = 95.24°, β = 91.48°, γ = 80.24°
Ratio:
a:b:c = 0.95 : 1 : 0.194

Optical Data of Zaherite

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 Zaherite

Formula:
Al12(SO4)5(OH)26 · 20H2O
Essential elements:
All elements listed in formula:

Relationship of Zaherite to other Species

7.DE.05MangazeiteAl2(SO4)(OH)4 · 3H2O
7.DE.10CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2O
7.DE.10CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
7.DE.10UKI-1975-(SO:AlCu)(Cu, Al, SO4, H2O)
7.DE.15SchwertmanniteFe163+(OH,SO4)12-13O16 · 10-12H2O
7.DE.20TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O
7.DE.25UtahiteCu5Zn3(TeO4)4(OH)8 · 7H2O
7.DE.35CoquanditeSb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
7.DE.40OsakaiteZn4(SO4)(OH)6 · 5H2O
7.DE.45WilcoxiteMgAl(SO4)2F · 17H2O
7.DE.50Stanleyite(V4+O)(SO4) · 6H2O
7.DE.55McalpineiteCu3(Te6+O6)
7.DE.60HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
7.DE.62VolaschioiteFe4(SO4)O2(OH)6 · 2H2O
7.DE.70LautenthalitePbCu4(SO4)2(OH)6 · 3H2O
7.DE.75CamerolaiteCu4Al2(HSbO4,SO4)(CO3)(OH)10 · 2H2O
25.6.1RostiteAl(SO4)(OH) · 5H2O
25.6.2JurbaniteAl(SO4)(OH) · 5H2O
25.6.3KhademiteAl(SO4)F · 5H2O
25.6.4Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
25.6.5AluminiteAl2(SO4)(OH)4 · 7H2O
25.6.6Meta-alunogenAl2(SO4)3 · 12H2O
25.6.7AlunogenAl2(SO4)3 · 17H2O
25.6.8FelsőbányaiteAl4(SO4)(OH)10 · 4H2O
25.6.9Basaluminite
25.6.10HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
25.6.12TamarugiteNaAl(SO4)2 · 6H2O
25.6.13MendoziteNaAl(SO4)2 · 11H2O
25.6.14Alum-(Na)NaAl(SO4)2 · 12H2O
25.6.15NatroaluniteNaAl3(SO4)2(OH)6
25.6.16KaliniteKAl(SO4)2 · 11H2O Not confirmed
25.6.17Alum-(K)KAl(SO4)2 · 12H2O
25.6.18AluniteKAl3(SO4)2(OH)6
25.6.19Natroalunite-2c(Na,Ca0.5,K)Al3(SO4)2(OH)6
25.6.20Tschermigite(NH4)Al(SO4)2 · 12H2O

Other Names for Zaherite

Name in Other Languages:
German:Zaherit
Spanish:Zaherita

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.

References for Zaherite

Reference List:
American Mineralogist (1977): 62: 1125-1128.

Mineralogical Magazine (1985): 49: 145-146.

American Mineralogist (1986): 71: 231-232.

Internet Links for Zaherite

Localities for Zaherite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
            • Porto Levante
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
 
  • 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
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