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Scorodite

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Formula:
Fe3+AsO4 · 2H2O
Colour:
Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, violet; colourless to faintly greenish or greenish brown in transmitted light.
Lustre:
Sub-Adamantine, Vitreous, Resinous
Hardness:
3½ - 4
Specific Gravity:
3.27
Crystal System:
Orthorhombic
Member of:
Name:
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)
8.CD.10

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
4 : (AB)5(XO4)2·xH2O
20.9.2

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

Physical Properties of ScoroditeHide

Sub-Adamantine, Vitreous, Resinous
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:
3½ - 4 on Mohs scale
Cleavage:
Imperfect/Fair
Imperfect on {201}, traces on {001}{100}
Fracture:
Sub-Conchoidal
Density:
3.27 g/cm3 (Measured)    3.276 g/cm3 (Calculated)

Optical Data of ScoroditeHide

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°
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
Dispersion:
relatively strong r > v
Pleochroism:
Weak
Comments:
blue-violet to blue-green

Chemical Properties of ScoroditeHide

Formula:
Fe3+AsO4 · 2H2O
Common Impurities:
Al

Crystallography of ScoroditeHide

Crystal System:
Orthorhombic
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
Ratio:
a:b:c = 0.87 : 1 : 0.973
Unit Cell 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.

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 www.smorf.nl.

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Transparency
Opaque | Translucent | Transparent

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacingIntensity
5.65(80)
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

BeudantitePbFe3(AsO4)(SO4)(OH)6
ChalcedonySiO2
ClaysA group of minerals, common in soils.
GypsumCaSO4 · 2H2O
Limonite(Fe,O,OH,H2O)
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 mindat.org.
Pharmacosiderite67 photos of Scorodite associated with Pharmacosiderite on mindat.org.
Carminite58 photos of Scorodite associated with Carminite on mindat.org.
Pyrite54 photos of Scorodite associated with Pyrite on mindat.org.
Bariopharmacosiderite30 photos of Scorodite associated with Bariopharmacosiderite on mindat.org.
Arseniosiderite23 photos of Scorodite associated with Arseniosiderite on mindat.org.
Segnitite22 photos of Scorodite associated with Segnitite on mindat.org.
Arthurite22 photos of Scorodite associated with Arthurite on mindat.org.
Jarosite20 photos of Scorodite associated with Jarosite on mindat.org.
Beudantite19 photos of Scorodite associated with Beudantite on mindat.org.

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

40.4.1.1VarisciteAlPO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
40.4.1.2StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
40.4.1.4MansfielditeAlAsO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
40.4.1.5YanomamiteInAsO4 · 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

Notes:
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

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