Mineralogy Database

Molysite Mineral Data

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General Molysite Information

Help on Chemical  Formula: Chemical Formula: Fe+++Cl3
Help on Composition: Composition: Molecular Weight = 162.21 gm
   Iron      34.43 %  Fe   49.23 % Fe2O3
   Chlorine  65.57 %  Cl   65.57 % Cl
               -   %  Cl  -14.80 % -O=Cl2   
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+Cl3
Help on Environment: Environment: volcanic fumaroles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Vesuvius, Italy Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek for a stain, as it stains the host rock.
Help on Name Pronunciation: Name Pronunciation: Molysite Say MOLYSITE

Molysite Image

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Comments: Yellow earthy molysite coatings.
Location: Sasso Pisano, Pisa, Tuscany, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Molysite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.91554
Help on Cell Dimensions: Cell Dimensions: a = 5.92, c = 17.26, Z = 6; V = 523.86 Den(Calc)= 3.08
Help on Crystal System: Crystal System: Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.68(1), 2.08(0.4), 5.9(0.32),

Physical Properties of Molysite

Help on Cleavage: Cleavage: {0001} Perfect
Help on Color: Color: Brownish red, Yellow, Purple red.
Help on Density: Density: 2.904
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Streak: Streak: brownish yellow

Optical Properties of Molysite

Help on Optical Data: Optical Data: Uniaxial (-), w=1.6.

Calculated Properties of Molysite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Molysite =3.08 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0072991318
Boson Index = 0.9927008682
Help on Photoelectric: Photoelectric: PEMolysite = 14.93 barns/electron
U=PEMolysite x rElectron Density= 43.66 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Molysite is Not Radioactive

Molysite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.03)Dana Type
  (09.03.01)Dana Group Molysite FeCl3 R 3 3
Help on  Strunz Class: Strunz Class: 03.AC.10 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AC -M:X = 1:3
03.AC.10 Molysite FeCl3 R 3 3

Other Molysite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Molysite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 03.AC.10





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