Erythrosiderite Mineral Data

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General Erythrosiderite Information

Chemical Formula:

K2Fe+++Cl5•(H2O)

Composition:

Molecular Weight = 329.32 gm

Potassium 23.74 % K 28.60 % K₂O

Iron 16.96 % Fe 24.25 % Fe₂O₃

Hydrogen 0.61 % H 5.47 % H₂O

Chlorine 53.83 % Cl 53.83 % Cl

- % Cl -12.15 % -O=Cl₂

Oxygen 4.86 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂Fe³⁺Cl₅•(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1872

Locality:

Vesuvius and Etna. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek, erythros = "red" and sideros = "iron."

Name Pronunciation:

Erythrosiderite + Pronunciation

Synonym:

ICSD 79782

PDF 29-1004

Erythrosiderite Image

Images:

Click Here for Larger Erythrosiderite Image

Erythrosiderite Salammoniac

Comments: Orange-brown aggregates of erythrosiderite with sal ammoniac. Material from the 1926 eruption of the Erythrosiderite is hygroscopic and must be stored in a closed vial. The photo was made through the vial.
Location: Vesuvius, Naples Province, Campania, Italy. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Erythrosiderite Crystallography

Axial Ratios:

a:b:c =1.3855:1:0.6983

Cell Dimensions:

a = 13.75, b = 9.924, c = 6.93, Z = 4; V = 945.63 Den(Calc)= 2.31

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

Forms:

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Forms: ( 1 1 0) ( 2 0 1) ( 1 0 1) ( 1 0 0)

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Crystal Structure:

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Schultz A J , Carlin R L , Acta Crystallographica, Section B , 51 (1995) p.43-47, Single-crystal pulsed neutron diffraction structure of the antiferromagnet, K2[FeCl5(H2O)] with and without applied pressure, Locality: synthetic, Sample: P = .14 GPa, Sample: T = 15 K

Physical Properties of Erythrosiderite

Cleavage:

{210} Perfect, {011} Perfect

Color:

Brown red, Red.

Density:

2.372

Diaphaneity:

Transparent to Translucent

Habit:

Pseudo Octohedral - Crystals show an octohedral outline.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous (Glassy)

Optical Properties of Erythrosiderite

Optical Data:

Biaxial (+), a=1.715, b=1.75, g=1.8, bire=0.0850, 2V(Calc)=82, 2V(Meas)=62. Dispersion strong, r > v.

Calculated Properties of Erythrosiderite

Electron Density:

Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Erythrosiderite =2.31 gm/cc.

Fermion Index:

Fermion Index = 0.0036478605
Boson Index = 0.9963521395

Photoelectric:

PE_{Erythrosiderite}= 11.09 barns/electron
U=PE_{Erythrosiderite} x r_electron= 24.74 barns/cc.

Radioactivity:

GRapi = 330.84 (Gamma Ray American Petroleum Institute Units)
Concentration of Erythrosiderite per GRapi unit = 0.30 (%)

Estimated Radioactivity from Erythrosiderite - barely detectable

Erythrosiderite Classification

Dana Class:

11.04.01.01 (11)Halide Complexes; Alumino-fluorides

(11.04)where (A)m B (X)5 · x(H2O)

(11.04.01)Dana Group

11.04.01.01 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m

11.04.01.02 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

03.CJ.10 03 - HALIDES

03.C - Complex Halides

03.CJ -With MX6 complexes; M = Fe, Mn, Cu

03.CJ.10 Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m

03.CJ.10 Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m

Other Erythrosiderite 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 Erythrosiderite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Erythrosiderite

K2Fe+++Cl5•(H2O)
Dana No: 11.04.01.01 Strunz No: 03.CJ.10
Locality:

Notes: