Hydromolysite Mineral Data

Hydromolysite Mineral Data +

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General Hydromolysite Information

Chemical Formula:

FeCl3·6(H2O)

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

Empirical Formula:

Fe³⁺Cl₃·6(H₂O)

Environment:

Sea water alteration of pyrite.

IMA Status:

Discredited IMA 1968

Locality:

Rio Marina, Elba, Italy. Link to MinDat.org Location Data.

Name Origin:

Named in 1965 for the composition.

Synonym:

Discredited

ICSD 30453

PDF 33-645

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Hydromolysite Crystallography

Axial Ratios:

a:b:c =1.6835:1:0.8468

Cell Dimensions:

a = 11.834, b = 7.029, c = 5.9524, Z = 2; beta = 100.47° V = 486.88 Den(Calc)= 1.84

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 5.824(1), 5.866(0.8), 3.163(0.15),

Physical Properties of Hydromolysite

Color:

Orange red.

Density:

1.84

Streak:

yellow orange

Optical Properties of Hydromolysite

Optical Data:

NCalc= 1.65 - from Gladstone-Dale relationship (KC = 0.3534) where Ncalc=Dcalc*KC+1
NCalc= 1.65 - from Gladstone-Dale relationship (KC = 0.3534) where Ncalc=Dmeas*KC+1

Calculated Properties of Hydromolysite

Electron Density:

r_electron=1.87 gm/cc
note: r_{Hydromolysite}=1.84 gm/cc.

Fermion Index

Fermion Index = 0.00455
Boson Index = 0.99545

Photoelectric:

PE_{Hydromolysite}= 8.55 barns/electron
U=PE_{Hydromolysite} x r_electron= 15.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hydromolysite is Not Radioactive

Hydromolysite Classification

Dana Class:

9.3.2.1 (9)Anhydrous and Hydrated Halides

(9.3)Dana Type

(9.3.2)Dana Group

9.3.2.1 Hydromolysite ? FeCl3·6(H2O) C 2/m 2/m

Strunz Class:

III/A.13-30 III - Halogenides

III/A - Simple Halogenides, with water Metal : Halogen = 1 : 1 to 1 : 3

III/A.13 - Cadwaladerite - Hydromolysite series

III/A.13-05 Lesukite! Al2(OH)5Cl·2(H2O) I m3m 4/m 3 2/m

III/A.13-10 Cadwaladerite Al(OH)2Cl·4(H2O) None

III/A.13-20 Chloraluminite AlCl3·6(H2O) R 3c 3 2/m

III/A.13-30 Hydromolysite FeCl3·6(H2O) C 2/m 2/m

Other Hydromolysite Information

References:

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

See Also:

Links to other databases for Hydromolysite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Print or Cut-and-Paste your Hydromolysite Specimen Label here :

Hydromolysite

FeCl3·6(H2O)
Dana No: 9.3.2.1 Strunz No: III/A.13-30
Locality:

Notes: