Arseniosiderite Mineral Data

Arseniosiderite Mineral Data +

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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."

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:

Arseniosiderite Cobaltarthurite

Comments: Olive-greenish crystalline druse of cobaltarthurite with spherical arseniosiderite.
Location: Pastrana, Mazarr?n, 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 - PrismaticH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Arseniosiderite

Electron Density:

r_electron=3.75 gm/cc
note: r_{Arseniosiderite}=3.92 gm/cc.

Fermion Index

Fermion Index = 0.00495
Boson Index = 0.99505

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Arseniosiderite is Not Radioactive

Arseniosiderite Classification

Dana Class:

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

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.4)Dana Group

42.8.4.1 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

42.8.4.2 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

42.8.4.3 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

Strunz Class:

VII/D.30-40 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.30 - Mitridatite series

VII/D.30-10 Xanthoxenite Ca4Fe2(PO4)4(OH)2·3(H2O) P1 1

VII/D.30-20 Kolfanite Ca2Fe3O2(AsO4)3·2(H2O) A2/a 2/m

VII/D.30-30 Mitridatite Ca2Fe3(PO4)3O2·3(H2O) A2/a 2/m

VII/D.30-40 Arseniosiderite Ca2Fe3(AsO4)3O2·3(H2O) A2/a 2/m

VII/D.30-45 Sailaufite! Ca2Mn3O2(AsO4)2(CO3)·3(H2O) Cm m

VII/D.30-50 Robertsite Ca6Mn9(PO4)9O6(H2O)6·3(H2O) A2/a 2/m

VII/D.30-60 Pararobertsite Ca2Mn3(PO4)3O2·3(H2O) P 2₁/c 2/m

Other Arseniosiderite Information

References:

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

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Arseniosiderite

Ca2Fe+++3(AsO4)3O2·3(H2O)
Dana No: 42.8.4.3 Strunz No: VII/D.30-40
Locality:

Notes: