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Natropharmacosiderite Mineral Data

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General Natropharmacosiderite Information

Help on Chemical  Formula: Chemical Formula: (Na,K)2Fe+++4(AsO4)3(OH)5•7(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na1.7K0.5Fe3+4(AsO4)2.9(OH)5.6•6.8(H2O)
Help on Environment: Environment: Found on a museum specimen, presumably an alteration product of arsenopyrite.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Marda, Western Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the sodium in the composition and its relationship to pharmacosiderite.
Help on Synonym: Synonym: Sodium pharmacosiderite - Renamed to Natropharmacosiderite by Mineralogical Record, v39 (2008), p131
 

Natropharmacosiderite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.012, Z = 1; V = 514.31 Den(Calc)= 2.91
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.99(1), 3.27(0.8), 2.831(0.6),
 

Physical Properties of Natropharmacosiderite

Help on Cleavage: Cleavage: {001} Imperfect
Help on Color: Color: Pale green, Dull orange.
Help on Density: Density: 2.79
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Cubic Crystals - Occurs as cubic shaped crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
 

Optical Properties of Natropharmacosiderite

Help on Gladstone-Dale: 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
Ncalc = 1.7 - 1.74
Help on Optical Data: Optical Data: Isotropic, n=1.705.
 

Calculated Properties of Natropharmacosiderite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Natropharmacosiderite =2.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0054567043
Boson Index = 0.9945432957
Help on Photoelectric: Photoelectric: PENatropharmacosiderite = 23.78 barns/electron
U=PENatropharmacosiderite x relectron= 64.55 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 30.39 (Gamma Ray American Petroleum Institute Units)
Concentration of Natropharmacosiderite per GRapi unit = 3.29 (%)

Estimated Radioactivity from Natropharmacosiderite - barely detectable

 

Natropharmacosiderite Classification

Help on  Dana Class: Dana Class: 42.08.01.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.08)where (AB)7 (XO4)4 Zq � x(H2O)
  (42.08.01)Pharmacosiderite Group
 
42.08.01.01 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m
 
42.08.01.02 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m
 
42.08.01.03 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m
 
42.08.01.04 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m
 
42.08.01.05 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m
Help on  Strunz Class: Strunz Class: 08.DK.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
 
08.DK.10 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m
 
08.DK.10 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m
 
08.DK.10 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m
 
08.DK.10 Barium-zinc-alumopharmacosiderite* (Ba,K)0.5(Zn,Cu)0.5(Al,Fe)4(AsO4)3•5(H2O) I 42m 4 2m
 
08.DK.10 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m
 
08.DK.10 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m
 

Other Natropharmacosiderite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Natropharmacosiderite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Natropharmacosiderite Specimen Label here :

Natropharmacosiderite

(Na,K)2Fe+++4(AsO4)3(OH)5•7(H2O)
Dana No: 42.08.01.05 Strunz No: 08.DK.10
Locality:

 

Notes:

 

 
   
 


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