Barium-alumopharmacosiderite Mineral Data

Barium-alumopharmacosiderite Mineral Data

General Barium-alumopharmacosiderite Information

Chemical Formula:

BaAl4(AsO4)3(OH)5·5(H2O)

Composition:

Molecular Weight = 837.12 gm

Barium 16.40 % Ba 18.32 % BaO

Aluminum 12.89 % Al 24.36 % Al₂O₃

Arsenic 26.85 % As 41.18 % As₂O₅

Hydrogen 1.81 % H 16.14 % H₂O

Oxygen 42.05 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₄(AsO₄)₃(OH)₅·5(H₂O)

IMA Status:

Discredited IMA 1971

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named in 1966 as the aluminum end member with barium pharmcosiderite.

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Barium-alumopharmacosiderite Crystallography

Cell Dimensions:

a = 7.7134, Z = 1; V = 458.92 Den(Calc)= 3.03

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): 7.8(1), 2.73(0.8), 3.16(0.7),3.87(0.7), 4.46(0.6), 2.32(0.5), 2.33(0.4), 2.44(0.4),

Physical Properties of Barium-alumopharmacosiderite

Color:

Yellow.

Diaphaniety:

Transparent to Translucent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Optical Properties of Barium-alumopharmacosiderite

Optical Data:

Uniaxial (?).

NCalc= 1.59 - from Gladstone-Dale relationship (KC = 0.1955) where Ncalc=Dcalc*KC+1

Calculated Properties of Barium-alumopharmacosiderite

Electron Density:

r_electron=2.88 gm/cc
note: r_{Barium-alumopharmacosiderite}=3.03 gm/cc.

Fermion Index

Fermion Index = 0.02944
Boson Index = 0.97056

Photoelectric:

PE_{Barium-alumopharmacosiderite}= 87.88 barns/electron
U=PE_{Barium-alumopharmacosiderite} x r_electron= 253.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Barium-alumopharmacosiderite is Not Radioactive

Barium-alumopharmacosiderite Classification

Dana Class:

42.8.1.4 (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.47-40 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.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-alumopharmacosiderite Information

References:

NAME( Dana8) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988)

See Also:

Links to other databases for Barium-alumopharmacosiderite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Barium-alumopharmacosiderite

BaAl4(AsO4)3(OH)5·5(H2O)
Dana No: 42.8.1.4 Strunz No: VII/D.47-40
Locality:

Notes: