Mineralogy Database

Hephaistosite Mineral Data

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General Hephaistosite Information

Help on Chemical  Formula: Chemical Formula: TlPb2Cl5
Help on Composition: Composition: Molecular Weight = 793.05 gm
   Thallium  24.23 %  Tl   27.07 % Tl2O3
   Lead      52.51 %  Pb   54.54 % Pb2O
   Bromine    1.41 %  Br    1.41 % Br
               -   %   Br   -0.14 % -O=Br2   
   Chlorine  21.68 %  Cl   21.68 % Cl
               -   %   Cl   -4.89 % -O=Cl2   
   Fluorine   0.17 %  F     0.17 % F
               -   %   F    -0.07 % -O=F2    
            ______        ______ 
            100.00 %       99.77 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Tl0.94Pb2.01Cl4.85Br0.14F0.07
Help on Environment: Environment: Found in a high-temperature fumarole (~400°C) at the rim of La Fossa crater. Isostructural with challacolloite.
Help on IMA Status: IMA Status: Approved IMA 2006 (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 the Greek god of fire, Hephaistos (Hephaestus), whose workshops were alleged located at the locality (Vulcano).
Help on Synonym: Synonym: IMA2006-043

Hephaistosite Image

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Comments: BSE image of hephaistosite crystals (CanMin, v43:701).
Location: Rim of La Fossa crater, Vulcano Island, Aeolian archipelago, Sicily, Italy. Scale: Crystal length 0.5 mm.
© Canadian Mineralogist

Hephaistosite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1295:1:1.5773
Help on Cell Dimensions: Cell Dimensions: a = 8.9477, b = 7.9218, c = 12.4955, Z = 4; beta = 90.092° V = 885.70 Den(Calc)= 5.95
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.696(1), 3.971(0.83), 2.109(0.45),2.569(0.42), 1.848(0.41), 2.851(0.38), 2.236(0.25), 2.273(0.22),

Physical Properties of Hephaistosite

Help on Color: Color: Pale yellow.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.

Optical Properties of Hephaistosite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.954 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1681,KC= 0.086
Ncalc = 1.51
Help on Optical Data: Optical Data: Biaxial (?), a=2

Calculated Properties of Hephaistosite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.94 gm/cc
note: Specific Gravity of Hephaistosite =5.95 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.11
Boson Index = 0.89
Help on Photoelectric: Photoelectric: PEHephaistosite =1,404.32 barns/electron
U=PEHephaistosite x rElectron Density=6,931.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hephaistosite is Not Radioactive

Hephaistosite Classification

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.05)where (A)m B (X)6
  (11.05.08)Challacolloite Group Challacolloite! KPb2Cl5 P 21/c 2/m Hephaistosite! TlPb2Cl5 P 21/c 2/m Steropesite! Tl3BiCl6 Cc m Panichiite! (NH4)2SnCl6 Fm3m 4 3m
Help on  Strunz Class: Strunz Class: 03.AA.55 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AA -M:X = 1:1, 2:3, 3:5, etc.
03.AA.55 Challacolloite! KPb2Cl5 P 21/c 2/m
03.AA.55 Hephaistosite! TlPb2Cl5 P 21/c 2/m

Other Hephaistosite Information

Help on References: References: NAME( AmMin, v94:399) PHYS. PROP.(AmMin, v94:399) OPTIC PROP.(AmMin, v94:399)
Help on See Also: See Also: Links to other databases for Hephaistosite :
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.AA.55





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