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Thermessaite Mineral Data
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General Thermessaite Information
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 Chemical Formula: |
K2[AlF3SO4] |
| Composition: |
Molecular Weight = 258.95 gm |
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Potassium 30.50 % K 36.74 % K2O |
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Aluminum 10.94 % Al 20.67 % Al2O3 |
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Sulfur 11.64 % S 29.06 % SO3 |
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Oxygen 23.66 % O |
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Fluorine 23.26 % F 23.26 % F |
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- %
F -9.79 % -O=F2 |
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______ ______ |
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100.00 % 99.94 % = TOTAL OXIDE |
| Empirical Formula: |
K2.02Al1.05F3.17S0.94O3.83 |
| Environment: |
Found as small colorless to white prismatic crystals in an active fumarole on the rim of the crater. |
| IMA Status: |
Approved IMA 2007 (Dana # Added) |
| Locality: |
La Fossa crater, Vulcano, Aeolian Islands, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for "Thermessa" an ancient Greek name for the island of Vulcano. |
| Synonym: |
IMA2007-030 |
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Thermessaite Image |
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Images:
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Thermessaite
Comments: BSE image of thermessaite crystals. (CanMin v46:693).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy.
Scale: See Image.
© Canadian Mineralogist |
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Thermessaite Crystallography
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| Axial Ratios: |
a:b:c =1.2967:1:0.8183 |
| Cell Dimensions: |
a = 10.81, b = 8.336, c = 6.822, Z = 4; V = 614.75 Den(Calc)= 2.80 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn |
| 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), |
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Physical Properties of Thermessaite
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| Cleavage: |
None |
| Color: |
Colorless, White. |
| Density: |
2.79 |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Thermessaite
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| Optical Data: |
Biaxial (?), b=1.445 |
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Calculated Properties of Thermessaite
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| Electron Density: |
Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Thermessaite =2.80 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0010231785
Boson Index = 0.9989768215 |
| Photoelectric: |
PEThermessaite = 4.23 barns/electron
U=PEThermessaite x relectron= 11.56 barns/cc.
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| Radioactivity: |
GRapi = 429.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Thermessaite per GRapi unit = 0.23 (%)
Estimated Radioactivity from Thermessaite  - barely detectable
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Thermessaite Classification
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| Dana Class: |
11.06.23.01 (11)Halide Complexes; Alumino-fluorides |
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(11.06)with miscellaneous formulae |
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(11.06.23)Dana Group |
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11.06.23.01 Thermessaite! K2[AlF3SO4] P bcn 2/m 2/m 2/m |
| Strunz Class: |
03.CG.25 03 - HALIDES |
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03.C - Complex Halides |
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03.CG -Aluminofluorides with CO3, SO4, PO4 |
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03.CG.25 Thermessaite! K2[AlF3SO4] P bcn 2/m 2/m 2/m |
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Other Thermessaite Information
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| References: |
NAME( AmMin, v94:404) PHYS. PROP.(AmMin, v94:404) OPTIC PROP.(AmMin, v94:404) |
| 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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Print or Cut-and-Paste your Thermessaite Specimen Label here :
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Thermessaite
K2[AlF3SO4]
Dana No: 11.06.23.01 Strunz No: 03.CG.25
Locality:
Notes:
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