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Arseniosiderite

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Formula:
Ca2Fe33+(AsO4)3O2 · 3H2O
System:
Monoclinic
Colour:
Golden-yellow to ...
Lustre:
Resinous, Greasy, Silky, Sub-Metallic
Hardness:
Name:
Named by Ours Pierre Armand Petit Dufrenoy in 1842 for ARSENIc and from the Greek σίδηρος "sideros" for "iron" in allusion to the mineral's composition, containing arsenic and iron.

Classification of Arseniosiderite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
8.DH.30

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Dana 7th ed.:
42.8.4.3
42.8.4.3

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
20.9.11

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

Year of Discovery:
1842
Geological Setting of Type Material:
An uncommon secondary mineral formed by the oxidation of earlier arsenic-bearing phases.
Associated Minerals at Type Locality:

Occurrences of Arseniosiderite

Geological Setting:
Oxidized zones of arsenic-bearing deposits.

Physical Properties of Arseniosiderite

Resinous, Greasy, Silky, Sub-Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Golden-yellow to yellow-brown, reddish-brown, brown, black; reddish brown to brownish yellow in transmitted light..
Streak:
Ocher-yellow.
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
On {001}, perfect.
Fracture:
Fibrous
Density:
3.58 - 3.6 g/cm3 (Measured)    3.78 g/cm3 (Calculated)

Crystallography of Arseniosiderite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 17.76Å, b = 19.53Å, c = 11.3Å
β = 96°
Ratio:
a:b:c = 0.909 : 1 : 0.579
Unit Cell Volume:
V 3,897.97 ų (Calculated from Unit Cell)
Z:
12
Morphology:
Pseudotetragonal. Cell space group: A2/a.

Commonly occurs as flattened fibers, in radial aggregates, and felted to granular masses. Euhedral crystals rare.
Comment:
A2/a
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.84 (100)
5.62 (50)
3.28 (40)
3.22 (40)
2.945 (50)
2.772 (80)
2.213 (40)
1.643 (40)
Comments:
ICDD 26-1002

Optical Data of Arseniosiderite

Type:
Biaxial (-)
RI values:
nα = 1.792 - 1.815 nβ = 1.870 - 1.898 nγ = 1.870 - 1.898
Birefringence:
0.08
Max Birefringence:
δ = 0.078 - 0.083
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v
Optical Extinction:
X perpendicular to {100}
Pleochroism:
Strong
Comments:
X = Nearly colourless to pale brownish or brownish red
Y = Z = Brownish red to dark brownish red
Comments:
Pseudouniaxial (-). 2V (measured) = small, essentially 0.

Chemical Properties of Arseniosiderite

Formula:
Ca2Fe33+(AsO4)3O2 · 3H2O
Essential elements:
All elements listed in formula:

Relationship of Arseniosiderite to other Species

Series:
Forms a series with Mitridatite (see here)
Forms a series with Robertsite (see here)
Other Members of Group:
KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
RobertsiteCa3Mn43+(PO4)3O2 · 3H2O
8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30PararobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa3Mn43+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O
20.9.1AngelelliteFe43+(AsO4)2O3
20.9.2ScoroditeFe3+AsO4 · 2H2O
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
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2O
20.9.13DussertiteBaFe33+(AsO4)(AsO3OH)(OH)6
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 Arseniosiderite

Other Information

Other Information:
Readily soluble in hot acids.
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 Arseniosiderite

Reference List:
Dufrénoy (1842) Annales des mines: 2: 343-346.

Dufrénoy (1843) Comptes rendu de l’Académie des sciences de Paris: 16: 22.

Rammelsberg (1846) Annalen der Physik, Halle, Leipzig: 68: 508.

Glocker, E.F. (1847) Generum et specierum mineralien secundum ordines naturals digestorum synopsis. Halle: 226 (as Arsenokrokite and Arsenocrocites).

Church (1873) Journal of the Chemical Society, London: 26: 102.

Lacroix (1886) Bulletin de la Société française de Minéralogie: 9: 3.

Sandberger (1886) Jb. Min.: I: 251.

Larsen, E.S. (1918) American Mineralogist: 3: 12.

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 42.

Barthoux (1925) Bulletin de la Société française de Minéralogie: 48: 104.

Foshag (1937) American Mineralogist: 22: 483.

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.: 953-955.

Moore, P.B. and Ito, J. (1974) I. Jahnsite, segelerite, and robertsite, three new transition metal phosphate species. II. Redefinition of overite, an isotype of segelerite. III. Isotypy of robertsite, mitridatite, and arseniosiderite. American Mineralogist, 59, 48–59.

Moore, P.B. and Araki, T. (1977): Mitridatite, Ca6(H2O)6[FeIII9 O6(PO4)9]•3H2O. A noteworthy octahedral sheet structure. Inorganic Chemistry, 16, 1096–1106.

Dunn, P.J. (1979): Contributions to the mineralogy of Franklin and Sterling Hill, New Jersey. Mineralogical Record, 10, 160–165.

Internet Links for Arseniosiderite

Localities for Arseniosiderite

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