Sodium-pharmacosiderite Mineral Data

Sodium-pharmacosiderite Mineral Data

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General Sodium-pharmacosiderite Information

Chemical Formula:

(Na,K)2Fe+++4(AsO4)3(OH)5·7(H2O)

Composition:

Molecular Weight = 902.63 gm

Potassium 2.17 % K 2.61 % K₂O

Sodium 4.33 % Na 5.84 % Na₂O

Iron 24.75 % Fe 35.38 % Fe₂O₃

Arsenic 24.07 % As 36.92 % As₂O₅

Hydrogen 2.14 % H 19.16 % H₂O

Oxygen 42.54 % O

______ ______

100.00 % 99.91 % = TOTAL OXIDE

Empirical Formula:

Na_1.7K_0.5Fe³⁺₄(AsO₄)_2.9(OH)_5.6·6.8(H₂O)

Environment:

Found on a museum specimen, presumably an alteration product of arsenopyrite.

IMA Status:

Approved IMA 1985

Locality:

Marda, Western Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the sodium in the composition and its relationship to pharmacosiderite.

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Sodium-pharmacosiderite Crystallography

Cell Dimensions:

a = 8.012, Z = 1; V = 514.31 Den(Calc)= 2.91

Crystal System:

Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43m

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

By Intensity(I/I_o): 7.99(1), 3.27(0.8), 2.831(0.6),

Physical Properties of Sodium-pharmacosiderite

Cleavage:

[001] Imperfect

Color:

Pale green, Dull orange.

Density:

2.79

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Cubic Crystals - Occurs as cubic shaped crystals.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Sodium-pharmacosiderite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.041 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2423,KPDmeas= 0.2527,KC= 0.2526

Optical Data:

Isotropic, n=1.705.

Calculated Properties of Sodium-pharmacosiderite

Electron Density:

r_electron=2.71 gm/cc
note: r_{Sodium-pharmacosiderite}=2.79 gm/cc.

Fermion Index

Fermion Index = 0.00545
Boson Index = 0.99455

Photoelectric:

PE_{Sodium-pharmacosiderite}= 23.78 barns/electron
U=PE_{Sodium-pharmacosiderite} x r_electron= 64.55 barns/cc.

Radioactivity:

GRapi = 30.39 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Sodium-pharmacosiderite - barely detectable

Sodium-pharmacosiderite Classification

Dana Class:

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

(42.8)where (AB)7 (XO4)4 Zq · x(H2O)

(42.8.1)Dana Group

42.8.1.1 Pharmacosiderite KFe4(AsO4)3(OH)4·6-7(H2O) I 43m 4 3m

42.8.1.2 Alumopharmacosiderite KAl4(AsO4)3(OH)4·6·5(H2O) P 43m 4 3m

42.8.1.3 Barium-pharmacosiderite BaFe4(AsO4)3(OH)5·5(H2O) I 42m 4 2m

42.8.1.4 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5·5(H2O) P 43m ? 4 3m

42.8.1.5 Sodium-pharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5·7(H2O) P 43m 4 3m

Strunz Class:

VII/D.47-30 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.47 - Pharmacosiderite series

VII/D.47-10 Alumopharmacosiderite KAl4(AsO4)3(OH)4·6·5(H2O) P 43m 4 3m

VII/D.47-20 Pharmacosiderite KFe4(AsO4)3(OH)4·6-7(H2O) I 43m 4 3m

VII/D.47-30 Sodium-pharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5·7(H2O) P 43m 4 3m

VII/D.47-40 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5·5(H2O) P 43m ? 4 3m

VII/D.47-50 Barium-pharmacosiderite BaFe4(AsO4)3(OH)5·5(H2O) I 42m 4 2m

Other Sodium-pharmacosiderite 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 Sodium-pharmacosiderite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Sodium-pharmacosiderite

(Na,K)2Fe+++4(AsO4)3(OH)5·7(H2O)
Dana No: 42.8.1.5 Strunz No: VII/D.47-30
Locality:

Notes: