Arseniosiderite Mineral Data

General Arseniosiderite Information

Chemical Formula:

Ca2Fe+++3(AsO4)3O2•3(H2O)

Composition:

Molecular Weight = 766.50 gm

Calcium 10.46 % Ca 14.63 % CaO

Iron 21.86 % Fe 31.25 % Fe₂O₃

Arsenic 29.32 % As 44.98 % As₂O₅

Hydrogen 0.79 % H 7.05 % H₂O

Oxygen 37.57 % O

______ ______

100.00 % 97.91 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe³⁺₃(AsO₄)₃O₃•3(H₂O)

Environment:

Occurs as a rare secondary mineral formed by the oxidation of earlier arsenic-bearing minerals, typically scorodite or arsenopyrite.

IMA Status:

Valid Species (Pre-IMA) 1842

Locality:

From Romaneche, Saone-et-Loire, France. At Huttenberg, Carinthia, Austria. In Germany, at Schneeberg, Saxony, and at Wittichen and Neubulach, Black Forest. Link to MinDat.org Location Data.

Name Origin:

For essential "arsenic" in the composition, and "sideros," Greek for "iron."

Name Pronunciation:

Arseniosiderite + Pronunciation

Arseniosiderite Image

Images:

Arseniosiderite

Comments: Yellowish brown, roughly spherical aggregates of arseniosiderite crystals on matrix.
Location: Tsumeb mine, Tsumeb, Namibia. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Cobaltarthurite Arseniosiderite

Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite.
Location: Pastrana, MazarrÃ³n, Murcia, Spain. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Arseniosiderite Crystallography

Axial Ratios:

a:b:c =0.9093:1:0.5785

Cell Dimensions:

a = 17.76, b = 19.53, c = 11.3, Z = 12; beta = 96° V = 3,897.97 Den(Calc)= 3.92

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.84(1), 2.772(0.8), 5.62(0.5),

Physical Properties of Arseniosiderite

Cleavage:

{100} Good

Color:

Bronze brown, Yellow, Yellow brown, Dark brown, Black.

Density:

3.5 - 3.9, Average = 3.7

Diaphaneity:

Translucent to Opaque

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

1.5 - Between Talc and Gypsum

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

ochraceous

Optical Properties of Arseniosiderite

Gladstone-Dale:

CI meas= -0.041 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.2352,KC= 0.226
Ncalc = 1.79 - 1.89

Optical Data:

Biaxial (-), a=1.815, b=1.898, g=1.898, bire=0.0830

Calculated Properties of Arseniosiderite

Electron Density:

Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Arseniosiderite =3.92 gm/cc.

Fermion Index:

Fermion Index = 0.004956593
Boson Index = 0.995043407

Photoelectric:

PE_{Arseniosiderite}= 27.84 barns/electron
U=PE_{Arseniosiderite} x rElectron Density= 104.49 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Arseniosiderite is Not Radioactive

Arseniosiderite Classification

Dana Class:

42.08.04.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.08)where (AB)7 (XO4)4 Zq ï¿½ x(H2O)

(42.08.04)Mitridatite Group

42.08.04.01 Mitridatite Ca2Fe3(PO4)3O2•3(H2O) A2/a 2/m

42.08.04.02 Robertsite Ca6Mn9(PO4)9O6(H2O)6•3(H2O) A2/a 2/m

42.08.04.03 Arseniosiderite Ca2Fe3(AsO4)3O2•3(H2O) A2/a 2/m

Strunz Class:

08.DH.30 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.30 Arseniosiderite Ca2Fe3(AsO4)3O2•3(H2O) A2/a 2/m

08.DH.30 Pararobertsite Ca2Mn3(PO4)3O2•3(H2O) P 2₁/c 2/m

08.DH.30 Kolfanite Ca2Fe3O2(AsO4)3•2(H2O) A2/a 2/m

08.DH.30 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)•4(H2O) P bca 2/m 2/m 2/m

08.DH.30 Robertsite Ca6Mn9(PO4)9O6(H2O)6•3(H2O) A2/a 2/m

08.DH.30 Mitridatite Ca2Fe3(PO4)3O2•3(H2O) A2/a 2/m

08.DH.30 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)•3(H2O) Cm m

Other Arseniosiderite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Arseniosiderite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Arseniosiderite

Ca2Fe+++3(AsO4)3O2•3(H2O)
Dana No: 42.08.04.03 Strunz No: 08.DH.30
Locality:

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