Mineralogy Database

Hydromolysite Mineral Data

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General Hydromolysite Information

Help on Chemical  Formula: Chemical Formula: FeCl3•6(H2O)
Help on Composition: Composition: Molecular Weight = 270.30 gm
   Iron      20.66 %  Fe   29.54 % Fe2O3
   Hydrogen   4.47 %  H    39.99 % H2O
   Chlorine  39.35 %  Cl   39.35 % Cl
               -   %   Cl   -8.88 % -O=Cl2   
   Oxygen    35.52 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+Cl3•6(H2O)
Help on Environment: Environment: Sea water alteration of pyrite.
Help on IMA Status: IMA Status: Discredited IMA 1968
Help on Locality: Locality: Rio Marina, Elba, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1965 for the composition.
Help on Name Pronunciation: Name Pronunciation: Hydromolysite + Pronunciation Say HYDROMOLYSITE
Help on Synonym: Synonym: Discredited
  ICSD 30453
  PDF 33-645

Hydromolysite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.6835:1:0.8468
Help on Cell Dimensions: Cell Dimensions: a = 11.834, b = 7.029, c = 5.9524, Z = 2; beta = 100.47° V = 486.88 Den(Calc)= 1.84
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.824(1), 5.866(0.8), 3.163(0.15),

Physical Properties of Hydromolysite

Help on Color: Color: Orange red.
Help on Density: Density: 1.84
Help on Streak: Streak: yellow orange

Calculated Properties of Hydromolysite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=1.87 gm/cc
note: Specific Gravity of Hydromolysite =1.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0045573942
Boson Index = 0.9954426058
Help on Photoelectric: Photoelectric: PEHydromolysite = 8.55 barns/electron
U=PEHydromolysite x rElectron Density= 15.94 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hydromolysite is Not Radioactive

Hydromolysite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.03)Dana Type
  (09.03.02)Dana Group Hydromolysite? FeCl3•6(H2O) C 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.XX.00 03 - Halogenides
  03.X - Unclassified Strunz Halogenides
  03.XX -Chloride, Hydrated
03.XX.00 Hydrophilite? CaCl2 Pnnm 2/m 2/m 2/m
03.XX.00 Hydromolysite? FeCl3•6(H2O) C 2/m 2/m
03.XX.00 Lorettoite? Pb7O6Cl2 pseudo-TET Ortho
03.XX.00 Yttrocerite* CaF2(Y,Ce)F3 Unk Cubic
03.XX.00 IMA2009-014 SrF2 F m3m 4/m 3 2/m
03.XX.00 IMA2009-015 NaSrCeF6 P 63/m 6/m

Other Hydromolysite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hydromolysite :
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.XX.00