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Scorodite

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Formula:
Fe3+AsO4 · 2H2O
System:
Orthorhombic
Colour:
Green, blue-green, grey, ...
Lustre:
Sub-Adamantine, Vitreous, Resinous
Hardness:
3½ - 4
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.

Classification of Scorodite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Scorodite

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

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:
3.27 g/cm3 (Measured)    3.276 g/cm3 (Calculated)

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.

Crystallographic forms of Scorodite

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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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.
X-Ray 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)

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°
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 Scorodite

Formula:
Fe3+AsO4 · 2H2O
Essential elements:
All elements listed in formula:
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:
Other Members of Group:
MansfielditeAlAsO4 · 2H2O
StrengiteFePO4 · 2H2O
VarisciteAlPO4 · 2H2O
YanomamiteInAsO4 · 2H2O
8.CD.05KolbeckiteScPO4 · 2H2O
8.CD.05MetavarisciteAlPO4 · 2H2O
8.CD.05PhosphosideriteFePO4 · 2H2O
8.CD.05UM2005-02-AsO:AlHPScSiScAsO4 · 2H2O
8.CD.10MansfielditeAlAsO4 · 2H2O
8.CD.10StrengiteFePO4 · 2H2O
8.CD.10VarisciteAlPO4 · 2H2O
8.CD.10YanomamiteInAsO4 · 2H2O
8.CD.15ParascoroditeFeAsO4 · 2H2O
8.CD.20Ludlamite(Fe,Mn,Mg)3(PO4)2 · 4H2O
8.CD.25SterlinghilliteMn3(AsO4)2 · 4H2O
8.CD.30RollanditeCu3(AsO4)2 · 4H2O
20.9.1AngelelliteFe43+(AsO4)2O3
20.9.3KaňkiteFeAsO4 · 3.5H2O
20.9.4FerrisymplesiteFe33+(AsO4)2(OH)3 · 5H2O
20.9.5KaatialaiteFe(H2AsO4)3 · 5H2O
20.9.6SymplesiteFe32+(AsO4)2 · 8H2O
20.9.7ParasymplesiteFe32+(AsO4)2 · 8H2O
20.9.8Natropharmacosiderite(Na,K)Fe43+(AsO4)3(OH)4 · 6-7H2O
20.9.9PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
20.9.10KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
20.9.11ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2O
20.9.13DussertiteBaFe33+(AsO4)2(OH)5
20.9.14Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2O
20.9.15MapimiteZn2Fe33+(AsO4)3(OH)4 · 10H2O
20.9.16OgdensburgiteCa2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O
20.9.17WalentaiteH(Ca,Mn2+,Fe2+)Fe33+(AsO4,PO4)4 · 7H2O

Other Names for Scorodite

Other Information

Other Information:
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 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

Specimens:
The following Scorodite specimens are currently listed for sale on minfind.com.

Localities for Scorodite

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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