Mineralogy Database

Erythrosiderite Mineral Data

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General Erythrosiderite Information

Help on Chemical  Formula: Chemical Formula: K2Fe+++Cl5•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2Fe3+Cl5•(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1872
Help on Locality: Locality: Vesuvius and Etna. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek, erythros = "red" and sideros = "iron."
Help on Name Pronunciation: Name Pronunciation: Erythrosiderite + Pronunciation Say ERYTHROSIDERITE
Help on Synonym: Synonym: ICSD 79782
  PDF 29-1004

Erythrosiderite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =1.3855:1:0.6983
Help on Cell Dimensions: Cell Dimensions: a = 13.75, b = 9.924, c = 6.93, Z = 4; V = 945.63 Den(Calc)= 2.31
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on Forms: Forms:

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I - Indicies
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Help on Above

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

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Physical Properties of Erythrosiderite

Help on Cleavage: Cleavage: {210} Perfect, {011} Perfect
Help on Color: Color: Brown red, Red.
Help on Density: Density: 2.372
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Pseudo Octohedral - Crystals show an octohedral outline.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Erythrosiderite

Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Erythrosiderite =2.31 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0036478605
Boson Index = 0.9963521395
Help on Photoelectric: Photoelectric: PEErythrosiderite = 11.09 barns/electron
U=PEErythrosiderite x relectron= 24.74 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.04)where (A)m B (X)5 � x(H2O)
  (11.04.01)Dana Group Erythrosiderite K2FeCl5•(H2O) P nma 2/m 2/m 2/m Kremersite (NH4,K)2FeCl5•(H2O) Pmnb 2/m 2/m 2/m
Help on  Strunz Class: 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

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 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

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Dana No: Strunz No: 03.CJ.10





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