Barium-pharmacosiderite Mineral Data

Barium-pharmacosiderite Mineral Data

General Barium-pharmacosiderite Information

Chemical Formula:

BaFe+++4(AsO4)3(OH)5·5(H2O)

Composition:

Molecular Weight = 952.59 gm

Barium 14.42 % Ba 16.10 % BaO

Iron 23.45 % Fe 33.53 % Fe₂O₃

Arsenic 23.60 % As 36.19 % As₂O₅

Hydrogen 1.59 % H 14.18 % H₂O

Oxygen 36.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaFe³⁺₄(AsO₄)₃(OH)₅·5(H₂O)

IMA Status:

Approved IMA 1966

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named as the barium analog of pharmacosiderite.

Barium-pharmacosiderite Image

Images:

Barium-pharmacosiderite

Comments: Reddish brown, crystal of barium-pharmacosiderite on matrix.
Location: Clara Mine, Wolfach, Baden-Wurt., Germany. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Barium-pharmacosiderite Crystallography

Axial Ratios:

a:c = 1:1.01274

Cell Dimensions:

a = 15.85, c = 16.052, Z = 8; V = 4,032.62 Den(Calc)= 3.14

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: I 42m

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

By Intensity(I/I_o): 3.962(1), 3.24(0.75), 4.017(0.75),

Physical Properties of Barium-pharmacosiderite

Color:

Brown.

Diaphaniety:

Transparent to Translucent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Barium-pharmacosiderite

Gladstone-Dale:

CI calc= 0.221 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1815,KC= 0.2331

Optical Data:

Uniaxial (+/-), a=1.57, b=1.57, bire=0.0000.

Calculated Properties of Barium-pharmacosiderite

Electron Density:

r_electron=2.97 gm/cc
note: r_{Barium-pharmacosiderite}=3.14 gm/cc.

Fermion Index

Fermion Index = 0.03084
Boson Index = 0.96916

Photoelectric:

PE_{Barium-pharmacosiderite}= 84.60 barns/electron
U=PE_{Barium-pharmacosiderite} x r_electron= 250.99 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barium-pharmacosiderite is Not Radioactive

Barium-pharmacosiderite Classification

Dana Class:

42.8.1.3 (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.47-50 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 Barium-pharmacosiderite Information

References:

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

See Also:

Links to other databases for Barium-pharmacosiderite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - Franklin Minerals(Dunn) 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Barium-pharmacosiderite

BaFe+++4(AsO4)3(OH)5·5(H2O)
Dana No: 42.8.1.3 Strunz No: VII/D.47-50
Locality:

Notes: