Zaherite (original) (raw)

A valid IMA mineral species

About ZaheriteHide

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Formula:

Al12(SO4)5(OH)26 · 20H2O

Colour:

White to blue-green

Name:

Named in 1977 by A. P. Ruotsala and L. L. Babcock in honour of Mohammed Abduz Zaher (1932, Bancharampur, Bangladesh - 27 August 2017, Dhaka, Bangladesh), geologist and director-general of the Geological Survey of Bangladesh. He discovered the mineral in the course of his master's thesis.

Dehydrates reversibly at room temperature.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:4381:2

809c3704-0287-4105-aa34-df0415e8eef3

IMA Classification of ZaheriteHide

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Type description reference:

Classification of ZaheriteHide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of ZaheriteHide

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Colour:

White to blue-green

Comment:

Aggregate hardness

Cleavage:

Very Good
In one direction

Density:

2.007 g/cm3 (Measured)

Comment:

Measured with a gas pycnometer

Optical Data of ZaheriteHide

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RI values:

_n_α = 1.498 _n_β = 1.498 _n_γ = 1.499

Birefringence:

Extremely low

δ = 0.001

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Chemistry of ZaheriteHide

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Mindat Formula:

Al12(SO4)5(OH)26 · 20H2O

Crystallography of ZaheriteHide

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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)

Comment:

Space group P1 or P-1.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of ZaheriteHide

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General Appearance of Type Material:

Veinlets (up to 1 cm across) that cut massive kaolinite-boehmite rock. Densely packed aggregates of extremely small grains.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, number 143793.

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Ruotsala, A.P., Babcock, L.L. (1977) Zaherite, a new hydrated aluminum sulfate. American Mineralogist: 62: 1125-1128.

Synonyms of ZaheriteHide

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Other Language Names for ZaheriteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Thermal Behaviour:

Hydrates and dehydrates reversibly at room temperature.
200 C = loss of hydrated water; 360 C = loss of hydroxyl; 855 C, 890 C = loss of SO2.

Health Risks:

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

Internet Links for ZaheriteHide

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References for ZaheriteHide

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Reference List:

Beukes, G. J., Schoch, A. E., de Bruiyn, H., Van der Westhuizen, W. A., Bok, L. D. C. (1984) A new occurrence of the hydrated aluminium sulphate zaherite, from Pofadder, South Africa. Mineralogical Magazine, 48 (346) 131-135 doi:10.1180/minmag.1984.048.346.18

De Bruiyn, H., Schoch, A. E., Beukes, G. J., Bok, L. D. C., Van Der Westhuizen, W. A. (1985) Note on cell parameters of zaherite. Mineralogical Magazine, 49 (350) 145-146 doi:10.1180/minmag.1985.049.350.26

Dunn, P.J., Chao, G.Y., Fitzpatrick, J.J., Langley, R.H., Fleischer, M., Zilczer, J.A. (1986) New mineral names. American Mineralogist: 71: 227-232.

Localities for ZaheriteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.