Alumopharmacosiderite Mineral Data

Alumopharmacosiderite Mineral Data

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General Alumopharmacosiderite Information

Chemical Formula:

KAl4(AsO4)3(OH)4·6·5(H2O)

Composition:

Molecular Weight = 748.91 gm

Potassium 5.22 % K 6.29 % K₂O

Aluminum 14.41 % Al 27.23 % Al₂O₃

Arsenic 30.01 % As 46.03 % As₂O₅

Hydrogen 2.29 % H 20.45 % H₂O

Oxygen 48.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KAl₄(AsO₄)₃(OH)₄·6.5(H₂O)

Environment:

With other oxidized arsenates on a museum specimen.

IMA Status:

Approved IMA 1981

Locality:

From the [Emma Louisa gold mine,] Guanaco district, about 100 km east-northeast of Taltal, Antofagasta, Chile. Link to MinDat.org Location Data.

Name Origin:

As the ALUMinum analog of "pharmacosiderite."

Synonym:

ICSD 76972

PDF 34-670

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Alumopharmacosiderite Crystallography

Cell Dimensions:

a = 7.745, Z = 1; V = 464.58 Den(Calc)= 2.68

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): 7.77(1), 2.739(0.6), 4.48(0.5),

Crystal Structure:

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Zemann J , Tschermaks Mineralogische und Petrographische Mitteilungen , 1 (1948) p.1-13, Formel und strukturtyp des pharmakosiderits

Physical Properties of Alumopharmacosiderite

Color:

White.

Diaphaniety:

Transparent to Translucent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Alumopharmacosiderite

Gladstone-Dale:

CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KC= 0.2128

Optical Data:

Isotropic, n=1.565.

Calculated Properties of Alumopharmacosiderite

Electron Density:

r_electron=2.63 gm/cc
note: r_{Alumopharmacosiderite}=2.68 gm/cc.

Fermion Index

Fermion Index = 0.00024
Boson Index = 0.99976

Photoelectric:

PE_{Alumopharmacosiderite}= 20.85 barns/electron
U=PE_{Alumopharmacosiderite} x r_electron= 54.77 barns/cc.

Radioactivity:

GRapi = 73.83 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Alumopharmacosiderite - barely detectable

Alumopharmacosiderite Classification

Dana Class:

42.8.1.2 (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.47-10 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 Alumopharmacosiderite 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 Alumopharmacosiderite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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Alumopharmacosiderite

KAl4(AsO4)3(OH)4·6·5(H2O)
Dana No: 42.8.1.2 Strunz No: VII/D.47-10
Locality:

Notes: