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Thermessaite

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About ThermessaiteHide

Formula:
K2AlF3(SO4)
Colour:
colourless to white
Lustre:
Vitreous
Specific Gravity:
2.77
Crystal System:
Orthorhombic
Name:
Named after Thermessa, an ancient Greek name of the island of Vulcano meaning "the warm island".
Isostructural with:
The K-analogue of thermessaite-(NH4).

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




Classification of ThermessaiteHide

Approved
Approval Year:
2007
3.CG.25

3 : HALIDES
C : Complex halides
G : Aluminofluorides with CO3, SO4, PO4

Physical Properties of ThermessaiteHide

Vitreous
Transparency:
Transparent
Colour:
colourless to white
Streak:
white
Hardness Data:
Could not be measured
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
2.77(2) g/cm3 (Measured)    2.790 g/cm3 (Calculated)
Comment:
from flotation at 25°C in bromoform-chloroform

Chemical Properties of ThermessaiteHide

Formula:
K2AlF3(SO4)

Crystallography of ThermessaiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Cell Parameters:
a = 10.81 Å, b = 8.336 Å, c = 6.822 Å
Ratio:
a:b:c = 1.297 : 1 : 0.818
Unit Cell V:
614.75 ų (Calculated from Unit Cell)
Morphology:
Prismatic with {110} and the pinacoid {100} as the dominant forms, terminated by minor {111}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.631 (70)
5.429 (14)
3.317 (28)
2.983 (100)
2.702 (82)
2.648 (14)
2.208 (30)
1.712 (58)

Type Occurrence of ThermessaiteHide

General Appearance of Type Material:
sharp translucent crystals up to 0.25 mm
Place of Conservation of Type Material:
Referece Collection of Dipartimento di Chimica Strutturale e Stereochimica Inorganica of Universita degli Studi di Milano, Milan, Italy
Geological Setting of Type Material:
An altered pyroclastic breccia in active medium- to high-temperature fumaroles at the rim of La Fossa crater.
Associated Minerals at Type Locality:

Synonyms of ThermessaiteHide

Other Language Names for ThermessaiteHide

Simplified Chinese:氟铝钾矾

Common AssociatesHide

Associated Minerals Based on Photo Data:
Vlodavetsite1 photo of Thermessaite associated with Vlodavetsite on mindat.org.
Cossaite1 photo of Thermessaite associated with Cossaite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.CG.05Stenonite(Sr,Ba,Na)2Al(CO3)F5Mon. 2/m
3.CG.10Chukhrovite-(Ce)Ca3(Ce,Y)[F|SO4|(AlF6)2] · 10H2OIso.
3.CG.10Chukhrovite-(Y)Ca3(Y,Ce)[F|SO4|(AlF6)2] · 10H2OIso.
3.CG.10MeniayloviteCa4[F|SO4|SiF6|AlF6] · 12H2OIso. m3 (2/m 3) : Fd3
3.CG.10Chukhrovite-(Nd)Ca3(Nd,Y)Al2(SO4)F13·12H2OIso. m3 (2/m 3) : Fd3
3.CG.15CreediteCa3SO4Al2F8(OH)2 · 2H2OMon. 2/m : B2/b
3.CG.20BøggilditeNa2Sr2Al2PO4F9Mon.

Fluorescence of ThermessaiteHide

none observed under both short- and long-wave

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 ThermessaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Gramacciolo, C.M., Campostrini, I. & Orlandi, P. (2008): Thermessaite, K2[AlF3|SO4], a new ino-aluminofluoride-sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy. Canadian Mineralogist 46, 693-700.

Internet Links for ThermessaiteHide

Localities for ThermessaiteHide

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.
Germany
 
  • North Rhine-Westphalia
    • Aachen
      • Alsdorf
Witzke, T., de Wit, F., Kolitsch, U. and Blaß, G. (2015): Mineralogy of the Burning Anna I Coal Mine Dump, Alsdorf, Germany. Chapter 7, pp. 203-240, in: Stracher, G. B., Prakash, A. and Sokol, E. V.: Coal and Peat Fires: A Global Perspective, Volume 3: Case Studies - Coal Fires, Elsevier, 786 pp.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Demartin, F., Gramacciolo, C.M., Campostrini, I. & Orlandi, P. (2008): Thermessaite, K2[AlF3|SO4], a new ino-aluminofluoride-sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy. Canadian Mineralogist 46, 693-700.
Mineral and/or Locality  
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