Thermessaite Mineral Data (original) (raw)

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

Click Here for Larger Thermessaite Image in a New Browser Window Images:

Click Here for Larger Thermessaite Image Thermessaite 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 - DipyramidalH-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),

Click Here for Large Thermessaite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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B - Bonds On/Off
Help on Above

| | Demartin F , Gramaccioli C M , Campostrini I , Orlandi P , The Canadian Mineralogist , 46 (2008) p.693-700, Thermessaite, K2[AlF3|SO4], a new ino-aluminofluoride-sulfate from La Fossa crater, Vulcano, Aeolian Islands, Italy, Locality: La Fossa crater, Vulcano, Aeolian Islands, Italy, Note: z-coordinate of S altered | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

11.06.23.01 (11)Halide Complexes; Alumino-fluorides

(11.06)with miscellaneous formulae

(11.06.23)Dana Group

11.06.23.01 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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Ask about Thermessaite here :
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Print or Cut-and-Paste your Thermessaite Specimen Label here :

Thermessaite

K2[AlF3SO4]
Dana No: 11.06.23.01 Strunz No: 03.CG.25
Locality:

Notes: