Molysite Mineral Data

General Molysite Information

Chemical Formula:

Fe+++Cl3

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

Empirical Formula:

Fe³⁺Cl₃

Environment:

volcanic fumaroles.

IMA Status:

Valid Species (Pre-IMA) 1868

Locality:

Vesuvius, Italy Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for a stain, as it stains the host rock.

Name Pronunciation:

Molysite

Molysite Image

Images:

Molysite

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

Molysite Crystallography

Axial Ratios:

a:c = 1:2.91554

Cell Dimensions:

a = 5.92, c = 17.26, Z = 6; V = 523.86 Den(Calc)= 3.08

Crystal System:

Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.68(1), 2.08(0.4), 5.9(0.32),

Crystal Structure:

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Hashimoto S , Forster K , Moss S C , Journal of Applied Crystallography , 22 (1988) p.173-180, Structure refinement of an FeCl3 crystal using a thin plate sample, Locality: synthetic

Physical Properties of Molysite

Cleavage:

{0001} Perfect

Color:

Brownish red, Yellow, Purple red.

Density:

2.904

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Streak:

brownish yellow

Optical Properties of Molysite

Optical Data:

Uniaxial (-), w=1.6.

Calculated Properties of Molysite

Electron Density:

Bulk Density (Electron Density)=2.92 gm/cc
note: Specific Gravity of Molysite =3.08 gm/cc.

Fermion Index:

Fermion Index = 0.0072991318
Boson Index = 0.9927008682

Photoelectric:

PE_Molysite= 14.93 barns/electron
U=PE_Molysite x rElectron Density= 43.66 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Molysite is Not Radioactive

Molysite Classification

Dana Class:

09.03.01.01 (09)Anhydrous and Hydrated Halides

(09.03)Dana Type

(09.03.01)Dana Group

09.03.01.01 Molysite FeCl3 R 3 3

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

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

Molysite

Fe+++Cl3
Dana No: 09.03.01.01 Strunz No: 03.AC.10
Locality:

Notes: