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Scorodite

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Hemerdon Mine (Hemerdon Bal Mine; Hemerdon Ball Mine), Plympton, Tavistock District, Devon, England, UK
© Steve Rust

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Formula:
Fe
3+
 
AsO
 
4
·2H
 
2
O
System:OrthorhombicColour:Green, blue-green, grey, ...
Lustre:Sub-Adamantine, Vitreous, ResinousHardness:3½ - 4
Name:From the Greek σκορόδιου = "Scorodion" Garlic-like, due to the smell when heated.
Dimorph of:Parascorodite


Variscite Group; Mansfieldite-Scorodite Series; Scorodite-Yanomamite Series.
The orthorhombic dimorph of Parascorodite. The ferric iron analogue of Manfieldite and Yanomamite.

A relatively common secondary mineral resulting from the oxidation of arsenopyrite or other arsenic-bearing species.

Classification of Scorodite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/C.09-80
Nickel-Strunz 10th (pending) edition ID:8.CD.10

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2
Dana 8th edition ID:40.4.1.3

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
Hey's CIM Ref.:20.9.2

20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
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Type Occurrence of Scorodite

Type Locality:Stamm Asser Mine, Graul, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1818

Occurrences of Scorodite

Geological Setting:In the secondary oxidation zone of iron bearing arsenides, in gossans; also observed in a primary hydrothermal deposit (Saubach).

Physical Properties of Scorodite

Lustre:Sub-Adamantine, Vitreous, Resinous
Diaphaneity (Transparency):Translucent
Colour:Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, violet; colourless to faintly greenish or greenish brown in transmitted light.
Comment:Earthy material: light green to light grayish or brownish green.
Streak:Greenish-White
Hardness (Mohs):3½ - 4
Cleavage:Imperfect/Fair
Imperfect on {201}, traces on {001}{100}
Fracture:Sub-Conchoidal
Density (measured):3.27 g/cm3
Density (calculated):3.276 g/cm3

Crystallography of Scorodite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 8.937Å, b = 10.278Å, c = 9.996Å
Ratio:a:b:c = 0.87 : 1 : 0.973
Unit Cell Volume:V 918.2 ų
Z:8
Morphology:Crystals commonly pyramidal {111} (sometimes pseudo-octahedral), tabular {001}, or prismatic [010]. Commonly aggregated into crusts or irregular groups. Also occurs massive, crystalline or porous and sinter-like, earthy.
Crystal Atlas:
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Scorodite no.3 - Goldschmidt (1913-1926)
Scorodite no.8 - Goldschmidt (1913-1926)

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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data: Peaks:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Scorodite

Type:Biaxial (+)
RI values: nα = 1.741 - 1.784 nβ = 1.744 - 1.805 nγ = 1.768 - 1.820
2V:Measured: 40° to 75°, Calculated: 46° to 80°
Maximum Birefringence:δ = 0.027 - 0.036

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:relatively strong r > v
Pleochroism:Weak
Comments:blue-violet to blue-green

Chemical Properties of Scorodite

Formula:
Fe
3+
 
AsO
 
4
·2H
 
2
O
Essential elements:As, Fe, H, O
All elements listed in formula:As, Fe, H, O
Common Impurities:Al

Relationship of Scorodite to other Species

Series:Forms a series with Yanomamite (see here)
Forms a series with Mansfieldite (see here)
Member of Group:
Variscite Group:
A(XO
 
4
)·2H
 
2
O where A = Fe
3+
 
, Al; X = P, As
Common Associates:
VivianitePharmacosideriteLimoniteGypsumClay
ChalcedonyBeudantite
Related Minerals - Nickel-Strunz Grouping):

- +
8.CD.05Kolbeckite
ScPO
 
4
·2H
 
2
O
8.CD.05Metavariscite
AlPO
 
4
·2H
 
2
O
8.CD.05Phosphosiderite
FePO
 
4
·2H
 
2
O
8.CD.05UM2005-02-AsO:AlHPScSi
ScAsO
 
4
·2H
 
2
O
8.CD.10Mansfieldite
AlAsO
 
4
·2H
 
2
O
8.CD.10Strengite
FePO
 
4
·2H
 
2
O
8.CD.10Variscite
AlPO
 
4
·2H
 
2
O
8.CD.10Yanomamite
InAsO
 
4
·2H
 
2
O
8.CD.15Parascorodite
Fe
3+
 
AsO
 
4
·2H
 
2
O
8.CD.20Ludlamite
(Fe,Mn,Mg)
 
3
(PO
 
4
)
 
2
·4H
 
2
O
8.CD.25Sterlinghillite
Mn
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
8.CD.30Rollandite
Cu
 
3
(AsO
 
4
)
 
2
·4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.9.1Angelellite
Fe
3+
4
[O
 
3
|(AsO
 
4
)
 
2
]
20.9.3Kaňkite
FeAsO
 
4
·3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
20.9.5Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
·5H
 
2
O
20.9.6Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.9.7Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
·8H
 
2
O
20.9.8Natropharmacosiderite
(Na,K)Fe
3+
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
[O
 
2
|(AsO
 
4
)
 
3
] · 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
[O
 
2
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
[(OH)
 
5
|(AsO
 
4
)
 
2
]
20.9.14Liskeardite
(Al,Fe
3+
 
)
 
3
[(OH)
 
6
|AsO
 
4
] · 5H
 
2
O
20.9.15Mapimite
Zn
 
2
Fe
3+
3
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)[(OH)
 
3
|(AsO
 
4
)
 
2
]
 
2
 · 6H
 
2
O
20.9.17Walentaite
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
[(AsO
 
4
,PO
 
4
)]
 
4
 · 7H
 
2
O

Other Names for Scorodite

Synonyms:
Arsenic SinterCupreous Arsenate of IronCupromartial ArsenateLoaisiteMartial Arsenate of Copper
Other Languages:
Catalan:Escorodita
French:Cuivre arseniaté ferrifère
Néoctèse
German:Skorodit
Arseniksinter
Eisensinter
Kobalt-Skorodit
Scorodit
Italian:Scorodite
Russian:Скородит
Spanish:Loaisita
Scorodita
Swedish:Jogynaite
Varieties:
Aluminian ScoroditePhosphoscorodite

Other Information

Other Information:Soluble in acids; decomposed in strong alkalies.

Alters to limonite.
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 Scorodite

Reference List:Bournon (1801) Royal Society of London, Philosophical Transactions: 191 (as Cupromartial Arsenate).

Haüy, R.J. (1809) Tableau comparative des résultants de la cristallographie et de l’analyse chimique relativement à la classification des minéraux. Paris: 91 (as Cuivre arseniaté ferrifére).

Breithaupt, A. (1818): Skorodit.- C.A.S. Hoffmann´s Handbuch der Mineralogie, Vol. 4.2. Freiberg, Verl. Craz & Gerlach, p. 182-185 (as Scorodit).

Beudant, F.S. (1832), Trailé élémentaire de Minéralogie, second edition, 2 volumes: 2: 605 (as Néoctèse).

Des Cloizeaux (1844) Annales de chimie et de physique, Paris: 10: 402.

Hermann (1845) Bull. Soc. Imp. Nat. Moscou: 1: 254 (as Arseniksinter, Eisensinter).

Lippmann (1857) von Hornberg, Zool. min. Ver. Regensberg: 11: 172 (as Kobalt-scorodit).

Koksharov (1870) Min. Russ.: 6: 320.

Nordenskiöld in: Koksharov (1873) Bull. ac. sc. St. Petersberg: 19: 571 (as Jogynaite ?).

Hague (1887) American Journal of Science: 34: 171.

Goldschmidt, V. (1890) Index der Krystallformen der Mineralien. 3 volumes: 3: 135.

Codazzi (1908) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 183 (as Loaisite).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 132.

Goldschmidt, V. (1922) Atlas der Krystallformen. 9 volumes, atlas, and text: vol. 8: : 58.

Chirva (1925) Bull. ac. sc. U.R.S.S.: [6]: 19: 731.

Piazza (1927) Reale accademia nazionale dei Lincei, Rome: [6]: 6: 70.

Foshag, Berman, and Doggett (1930) American Mineralogist: 15: 390.

Ito and Shiga (1932) Mineralogical Magazine: 23: 130.

Hintze, Carl (1933) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4A]: 1289.

Foshag (1937) American Mineralogist: 22: 482.

Kokkoros (1938) Prakt. Ac Athènes: 13: 337.

Strunz (1938) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 99: 513.

McConnell (1940) American Mineralogist: 25: 719.

Rossetti (1941) Periodico de Mineralogia-Roma: 12: 433.

Allen and Fahey (1948) American Mineralogist: 33: 122.

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. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 763-767.

Mineralogical Magazine (1966): 35: 776-777.

Hawthorne, F. C. (1976): The hydrogen positions in scorodite. Acta Crystallographica, B32, 2891-2892.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 531.

Internet Links for Scorodite

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