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Scorodite

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Formula:
FeAsO
 
4
· 2H
 
2
O
System:OrthorhombicColour:Green, blue-green, grey, ...
Lustre:Sub-Adamantine, Vitreous, ResinousHardness:3½ - 4
Member of:Variscite Group
Name:Named in 1818 by Johann Friedrich August Breithaupt 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 Mansfieldite 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)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray Powder Diffraction:
d-spacingIntensity
5.65(80)
5.05 (40)
4.50 (100)
3.20 (80)
3.07 (60)
3.01 (60)
2.601 (60)

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:
FeAsO
 
4
· 2H
 
2
O
Simplified for copy/paste:FeAsO4·2H2O
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)
Forms a series with Strengite (see here)
Member of:Variscite Group
Other Members of Group:

- +
Mansfieldite
AlAsO
 
4
· 2H
 
2
O
Strengite
FePO
 
4
· 2H
 
2
O
Variscite
AlPO
 
4
· 2H
 
2
O
Yanomamite
InAsO
 
4
· 2H
 
2
O
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
FeAsO
 
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
(AsO
 
4
)
 
2
O
 
3
20.9.3Kaňkite
FeAsO
 
4
· 3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
· 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
(AsO
 
4
)
 
3
(OH)
 
4
· 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
· 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
(AsO
 
4
)
 
3
O
 
2
· 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
(AsO
 
4
)
 
3
O
 
2
· 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
 
3
· 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
5
20.9.14Liskeardite
[(Al,Fe)
 
32
(AsO
 
4
)
 
18
(OH)
 
42
(H
 
2
O)
 
22
] · 52H
 
2
O
20.9.15Mapimite
Zn
 
2
Fe
3+
3
(AsO
 
4
)
 
3
(OH)
 
4
· 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)(AsO
 
4
)
 
4
(OH)
 
6
· 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 ArsenateIoguneiteLoaisite
Martial Arsenate of CopperSkorodite
Other Languages:
Catalan:Escorodita
French:Cuivre arseniaté ferrifère
Néoctèse
German:Skorodit
Arseniksinter
Eisensinter
Kobalt-Skorodit
Prismatisches Flusshaloid
Scorodit
Italian:Scorodite
Russian:Скородит
Simplified Chinese:臭葱石
Spanish:Loaisita
Scorodita
Swedish:Jogynaite
Traditional Chinese:臭蔥石
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

Search Engines:
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  • External Links:
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  • Look for Scorodite on Wikipedia
  • Look for Scorodite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Scorodite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Scorodite specimens for sale - minfind.com
  • Buy rare minerals from Excalibur Minerals
  • Specimens:The following Scorodite specimens are currently listed for sale on minfind.com.

    Localities for Scorodite

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