Erythrosiderite Mineral Data

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."

Synonym:

ICSD 79782

PDF 29-1004

Erythrosiderite Image

Images:

Click Here for Larger Erythrosiderite Image

Erythrosiderite Sal-ammoniac

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

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Forms: [ 1 1 0] [ 2 0 1] [ 1 0 1] [ 1 0 0]

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Physical Properties of Erythrosiderite

Cleavage:

[210] Perfect, [011] Perfect

Color:

Brown red, Red.

Density:

2.372

Diaphaniety:

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

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3268,KPDmeas= 0.3183,KC= 0.3211

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:

r_electron=2.29 gm/cc
note: r_{Erythrosiderite}=2.37 gm/cc.

Fermion Index

Fermion Index = 0.00364
Boson Index = 0.99636

Photoelectric:

PE_{Erythrosiderite}= 11.09 barns/electron
U=PE_{Erythrosiderite} x r_electron= 25.40 barns/cc.

Radioactivity:

GRapi = 330.84 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Erythrosiderite - barely detectable

Erythrosiderite Classification

Dana Class:

11.4.1.1 (11)Halide Complexes; Alumino-fluorides

(11.4)where (A)m B (X)5 · x(H2O)

(11.4.1)Dana Group

11.4.1.1 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m

11.4.1.2 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m

Strunz Class:

III/C.07-30 III - Halogenides

III/C - Double halogenides with water, Chlorides

III/C.07 - Rinneite - Kremersite series

III/C.07-10 Mitscherlichite K2CuCl4·2(H2O) P 4₁/mnm 4/m 2/m 2/m

III/C.07-20 Douglasite K2FeCl4·2(H2O) Unk. Mono

III/C.07-30 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m

III/C.07-40 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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

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Erythrosiderite

K2Fe+++Cl5·(H2O)
Dana No: 11.4.1.1 Strunz No: III/C.07-30
Locality:

Notes: