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Erythrosiderite

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Somma-Vesuvius Complex, Naples Province, Campania, Italy
© Thomas Witzke

Formula:
K
 
2
[Fe
3+
 
Cl
 
5
(OH
 
2
)]
System:OrthorhombicColour:Ruby-red to red, ...
Name:From the Greek έρυθρός, red, and σίδηρος, iron, in allusion to the color and iron content.
Isostructural with:Kremersite
This page provides mineralogical data about Erythrosiderite.

Classification of Erythrosiderite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/C.07-30
Nickel-Strunz 10th (pending) edition ID:3.CJ.10

3 : HALIDES
C : Complex halides
J : With MX6 complexes; M = Fe, Mn, Cu
Dana 8th edition ID:11.4.1.1

11 : HALIDE COMPLEXES
4 : AmBX5·xH2O
Hey's CIM Ref.:8.11.5

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
11 : Halides of Fe and Ni
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Type Occurrence of Erythrosiderite

Type Locality:Mt. Vesuvius, Somma-Vesuvius Complex, Naples Province, Campania, Italy
Year of Discovery:1872
Geological Setting of type material:Active volcanic fumaroles.
Associated Minerals at type locality:
MolysiteHematite

Physical Properties of Erythrosiderite

Lustre:Vitreous
Colour:Ruby-red to red, brownish red; brown-red or yellowish in transmitted light.
Cleavage:Perfect
On {201} and {011}.
Density (measured):2.372 g/cm3

Crystallography of Erythrosiderite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma (P21/n 21/m 21/a)
Cell Parameters:a = 9.7Å, b = 13.58Å, c = 7.01Å
Ratio:a:b:c = 0.714 : 1 : 0.516
Unit Cell Volume:V 923.40 ų (Calculated from Unit Cell)
Morphology:Crystals somewhat tabular {100}.
Twinning:On [21_1] and [20_1] (artificial material).

Optical Data of Erythrosiderite

Type:Biaxial (+)
RI values: nα = 1.715 nβ = 1.750 nγ = 1.800
2V:Measured: 62° , Calculated: 82°
Maximum Birefringence:δ = 0.085

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:strong

Chemical Properties of Erythrosiderite

Formula:
K
 
2
[Fe
3+
 
Cl
 
5
(OH
 
2
)]
Essential elements:Cl, Fe, H, K, O
All elements listed in formula:Cl, Fe, H, K, O
Common Impurities:Al

Relationship of Erythrosiderite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.CJ.05Chlormanganokalite
K
 
4
[MnCl
 
6
]
3.CJ.05Rinneite
K
 
3
Na[FeCl
 
6
]
3.CJ.10Kremersite
(NH
 
4
,K)
 
2
[Fe
3+
 
Cl
 
5
(H
 
2
O)]
3.CJ.15Mitscherlichite
K
 
2
[CuCl
 
4
] · 2H
 
2
O
3.CJ.20Douglasite
K
 
2
[Fe
2+
 
Cl
 
4
(OH
 
2
)
 
2
]
3.CJ.25Redikortsevite
(NH
 
4
)MgCl
 
3
 · 6H
 
2
O
3.CJ.30Zirklerite
(Fe,Mg,Ca)
 
9
Al
 
4
Cl
 
18
(OH)
 
12
·14H
 
2
O (?)
Related Minerals - Hey's Index Grouping:

- +
8.11.1Molysite
FeCl
 
3
8.11.2 Hydromolysite
FeCl
 
3
·6H
 
2
O
8.11.3Rokühnite
FeCl
 
2
·2H
 
2
O
8.11.4Douglasite
K
 
2
[Fe
2+
 
Cl
 
4
(OH
 
2
)
 
2
]
8.11.6Rinneite
K
 
3
Na[FeCl
 
6
]
8.11.7Kremersite
(NH
 
4
,K)
 
2
[Fe
3+
 
Cl
 
5
(H
 
2
O)]
8.11.8Iowaite
Mg
 
4
Fe(OH)
 
8
OCl·4H
 
2
O
8.11.9Nickelbischofite
NiCl
 
2
·6H
 
2
O
8.11.10Lawrencite
(Fe
2+
 
,Ni)Cl
 
2

Other Names for Erythrosiderite

Other Languages:
German:Erythrosiderit
Italian:Eritrosiderite
Russian:Эритросидерит
Spanish:Erythrosiderita

Other Information

Other Information:Very deliquescent. Readily soluble in water.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Erythrosiderite

Reference List:Scacchi (1872) Reale accademia delle scienze fisische e matematiche, Naples, Rendus: 210.

Scacchi, A. (1874) Contribuzioni mineralogiche per servire all Storia dell’ Incendio Vesuviano, del mese di Aprile, Part 2: 42.

Gossner (1905) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 40: 73 (artif. mat.)

Merwin in: Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 135.

Zambonini, Ferruccio (1935) Mineralogia Vesuviana, second edition with Quercigh, 463 pp., Naples: 107.

Bellanca, A. (1948) Periodico di Mineralogia – Roma: 17: 1.

Bellanca, A. (1948) La struttura dell'eritrosiderite. Periodico di Mineralogia – Roma: pp. 59-72.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 101-103.

National Bureau of Standards (U.S.) Monograph 25, section 14: 27.

Articles/Blogs about Erythrosiderite

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    Localities for Erythrosiderite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Saxony-Anhalt
      • Stassfurt Potash deposit
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 102.
    Italy
     
    • Campania
      • Naples Province
        • Somma-Vesuvius Complex
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 102; Lapis (1994): 5: 13-23, 58.
    • Sicily
      • Catania Province
        • Etna Volcanic Complex
    		Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 102; AA. VV., 1996. Collezionare minerali. Hobby & Work.
    USA
     
    • New Mexico
      • Eddy Co.
    		Northrop, Minerals of New Mexico, 3rd. rev. ed. (1996)
    Mineral and/or Locality
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