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Thermessaite-(NH4)

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Big Photo

Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany
© Frank de Wit

Show Thermessaite-(NH4) Photos (4)



Formula:
(NH
 
4
)
 
2
(AlF
 
3
)(SO
 
4
)
NH4 may be replaced by minor K.
System:Orthorhombic
Name:For being the NH4-analogue of thermessaite.
Isostructural with:Thermessaite


The ammonium analogue of thermessaite.

Also originally found as an anthropogenic compound ('Unnamed (NH4-analogue of Thermessaite)') on a burning coal dump at the Anna mine, Aachen (U. Kolitsch, 2010, unpubl. data on material collected by Frank de Wit).

This mineral contains linear infinite chains of repeating (AlF3) units, classifying it as a so-called ino-fluoro-aluminate.

Classification of Thermessaite-(NH4)

IMA status:Approved 2011
mindat.org URL:http://www.mindat.org/min-39963.html
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Type Occurrence of Thermessaite-(NH4)

Type Locality:La Fossa crater, Vulcano Island, Lipari, Eolie Islands (Aeolian Islands), Messina Province, Sicily, Italy
Place of Conservation of Type Material:Type material is deposited in the collections of the C.L. Garavelli Museum in the Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari ‘‘Aldo Moro’’, Italy, sample number 15/nm-V28.

Crystallography of Thermessaite-(NH4)

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbcn {P21/b 2/c 21/n}
Cell Parameters:a = 11.3005(3) Å, b = 8.6125(3) Å, c = 6.8501(2) Å
Ratio:a:b:c = 1.312 : 1 : 0.795
Unit Cell Volume:V 666.69 ų (Calculated from Unit Cell)
Morphology:Acicular.
Comment:Cell of anthropogenic material: a = 11.286(2), 8.607(2), 6.843(1) A.
X-Ray Powder Diffraction:
d-spacingIntensity
6.850 (74)
5.650 (100)
4.844 (89)
3.082 (47)
3.063 (56)
2.782 (26)
2.681 (28)

Chemical Properties of Thermessaite-(NH4)

Formula:
(NH
 
4
)
 
2
(AlF
 
3
)(SO
 
4
)


NH4 may be replaced by minor K.
Essential elements:Al, F, H, N, O, S
All elements listed in formula:Al, F, H, N, O, S

Other Names for Thermessaite-(NH4)

Synonyms:
IMA2011-077 Unnamed (NH4-analogue of Thermessaite)
Other Languages:

Other Information

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

References for Thermessaite-(NH4)

Reference List:

- +
Garavelli, A., Mitolo, D. and Pinto, D. (2012): Thermessaite-(NH4), IMA 2011-077. CNMNC Newsletter No. 12, February 2012, page 152; Mineralogical Magazine, 76, 151-155.

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    • Localities for Thermessaite-(NH4)

    The 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.
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    (TL) indicates type locality. ? 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.
    Germany
     
    • North Rhine-Westphalia
      • Aachen
        • Alsdorf
    		de Wit et al., to be published (Uwe Kolitsch SXRD data on material collected by Frank de Wit)
    Italy
     
    • Sicily
      • Messina Province
        • Eolie Islands (Aeolian Islands)
          • Lipari
            • Vulcano Island
    		Garavelli, A., Mitolo, D. and Pinto, D. (2012): Thermessaite-(NH4), IMA 2011-077. CNMNC Newsletter No. 12, February 2012, page 152; Mineralogical Magazine, 76, 151-155.
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