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Thermessaite Mineral Data

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General Thermessaite Information

Help on Chemical  Formula: Chemical Formula: K2[AlF3SO4]
Help on Composition: Composition: Molecular Weight = 258.95 gm
   Potassium  30.50 %  K    36.74 % K2O
   Aluminum   10.94 %  Al   20.67 % Al2O3
   Sulfur     11.64 %  S    29.06 % SO3
   Oxygen     23.66 %  O
   Fluorine   23.26 %  F    23.26 % F
                -   %   F    -9.79 % -O=F2    
             ______        ______ 
             100.00 %       99.94 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2.02Al1.05F3.17S0.94O3.83
Help on Environment: Environment: Found as small colorless to white prismatic crystals in an active fumarole on the rim of the crater.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: La Fossa crater, Vulcano, Aeolian Islands, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for "Thermessa" an ancient Greek name for the island of Vulcano.
Help on Synonym: Synonym: IMA2007-030

Thermessaite Image

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Comments: BSE image of thermessaite crystals. (CanMin v46:693).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy. Scale: See Image.
© Canadian Mineralogist

Thermessaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2967:1:0.8183
Help on Cell Dimensions: Cell Dimensions: a = 10.81, b = 8.336, c = 6.822, Z = 4; V = 614.75 Den(Calc)= 2.80
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.983(1), 2.702(0.82), 6.631(0.7),1.712(0.58), 2.208(0.3), 3.317(0.28), 2.648(0.14), 5.429(0.14),

Physical Properties of Thermessaite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.79
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Thermessaite

Help on Optical Data: Optical Data: Biaxial (?), b=1.445

Calculated Properties of Thermessaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Thermessaite =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010231785
Boson Index = 0.9989768215
Help on Photoelectric: Photoelectric: PEThermessaite = 4.23 barns/electron
U=PEThermessaite x relectron= 11.56 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 429.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Thermessaite per GRapi unit = 0.23 (%)

Estimated Radioactivity from Thermessaite - barely detectable


Thermessaite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.06)with miscellaneous formulae
  (11.06.23)Dana Group Thermessaite! K2[AlF3SO4] P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.CG.25 03 - HALIDES
  03.C - Complex Halides
  03.CG -Aluminofluorides with CO3, SO4, PO4
03.CG.25 Thermessaite! K2[AlF3SO4] P bcn 2/m 2/m 2/m

Other Thermessaite Information

Help on References: References: NAME( AmMin, v94:404) PHYS. PROP.(AmMin, v94:404) OPTIC PROP.(AmMin, v94:404)
Help on See Also: See Also: Links to other databases for Thermessaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 03.CG.25





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