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Fe3+AsO4 · 2H2O
Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, violet; colourless to faintly greenish or greenish brown in transmitted light.
Sub-Adamantine, Vitreous, Resinous
3½ - 4
Specific Gravity:
Crystal System:
Member of:
Named in 1818 by Johann Friedrich August Breithaupt from the Greek σκορόδιου = "Scorodion" - garlic-like, due to the smell when heated.
Dimorph of:
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.

Compare 'UM1979-03-AsO:Fe' and 'UM1979-04-AsO:Fe'.

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Classification of ScoroditeHide

Approved, 'Grandfathered' (first described prior to 1959)

C : Phosphates without additional anions, with H2O
D : With only medium-sized cations, RO4:H2O = 1:2

4 : (AB)5(XO4)2·xH2O

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

Physical Properties of ScoroditeHide

Sub-Adamantine, Vitreous, Resinous
Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, violet; colourless to faintly greenish or greenish brown in transmitted light.
Earthy material: light green to light grayish or brownish green.
3½ - 4 on Mohs scale
Imperfect on {201}, traces on {001}{100}
3.27 g/cm3 (Measured)    3.276 g/cm3 (Calculated)

Optical Data of ScoroditeHide

Biaxial (+)
RI values:
nα = 1.741 - 1.784 nβ = 1.744 - 1.805 nγ = 1.768 - 1.820
Measured: 40° to 75°, Calculated: 46° to 80°
Max Birefringence:
δ = 0.027 - 0.036
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
relatively strong r > v
blue-violet to blue-green

Chemical Properties of ScoroditeHide

Fe3+AsO4 · 2H2O
Common Impurities:

Crystallography of ScoroditeHide

Crystal System:
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 8.937 Å, b = 10.278 Å, c = 9.996 Å
a:b:c = 0.87 : 1 : 0.973
Unit Cell V:
918.2 ų
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.

Crystallographic forms of ScoroditeHide

Crystal Atlas:
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Scorodite no.3 - Goldschmidt (1913-1926)
Scorodite no.8 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by

Edge Lines | Miller Indicies | Axes

Opaque | Translucent | Transparent

Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation

X-Ray Powder DiffractionHide

Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
5.05 (40)
4.50 (100)
3.20 (80)
3.07 (60)
3.01 (60)
2.601 (60)

Type Occurrence of ScoroditeHide

Synonyms of ScoroditeHide

Other Language Names for ScoroditeHide

Varieties of ScoroditeHide

Aluminian ScoroditeAn Al-bearing scorodite.
PhosphoscoroditeAn intermediate between Scorodite and Strengite

Relationship of Scorodite to other SpeciesHide

Member of:
Other Members of this group:
MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Forms a series with:

Common AssociatesHide

ClaysA group of minerals, common in soils.
GypsumCaSO4 · 2H2O
PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2O
VivianiteFe2+3(PO4)2 · 8H2O
Associated Minerals Based on Photo Data:
Quartz90 photos of Scorodite associated with Quartz on
Pharmacosiderite67 photos of Scorodite associated with Pharmacosiderite on
Carminite58 photos of Scorodite associated with Carminite on
Pyrite54 photos of Scorodite associated with Pyrite on
Bariopharmacosiderite30 photos of Scorodite associated with Bariopharmacosiderite on
Arseniosiderite23 photos of Scorodite associated with Arseniosiderite on
Segnitite22 photos of Scorodite associated with Segnitite on
Arthurite22 photos of Scorodite associated with Arthurite on
Jarosite20 photos of Scorodite associated with Jarosite on
Beudantite19 photos of Scorodite associated with Beudantite on

Related Minerals - Nickel-Strunz GroupingHide

8.CD.CastellaroiteMn2+3(AsO4)2·4H2OMon. 2/m
8.CD.05KolbeckiteScPO4 · 2H2OMon. 2/m
8.CD.05MetavarisciteAlPO4 · 2H2OMon. 2/m : P21/b
8.CD.05PhosphosideriteFePO4 · 2H2OMon. 2/m
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.10YanomamiteInAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.CD.15ParascoroditeFeAsO4 · 2H2OTrig.
8.CD.20Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2OMon. 2/m : P21/b
8.CD.25SterlinghilliteMn3(AsO4)2 · 4H2OTric. 1 : P1
8.CD.30RollanditeCu3(AsO4)2 · 4H2OOrth.

Related Minerals - Dana Grouping (8th Ed.)Hide · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.9.1AngelelliteFe3+4(AsO4)2O3Tric. 1 : P1
20.9.3KaňkiteFeAsO4 · 3.5H2OMon.
20.9.4FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2OMon.
20.9.5KaatialaiteFe(H2AsO4)3 · 5H2OMon. 2/m
20.9.6SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
20.9.7ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.9.8Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.9PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.10KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
20.9.11ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
20.9.13DussertiteBaFe3+3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.9.14Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2OOrth.
20.9.15MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
20.9.16OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
20.9.17WalentaiteH(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4 · 7H2OOrth.

Other InformationHide

Soluble in acids; decomposed in strong alkalies.

Alters to limonite.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ScoroditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 ScoroditeHide

Localities for ScoroditeHide

This 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.

Locality ListShow

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