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Alumopharmacosiderite Mineral Data
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General Alumopharmacosiderite Information
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Chemical Formula: |
KAl4(AsO4)3(OH)4•6•5(H2O) |
Composition: |
Molecular Weight = 748.91 gm |
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Potassium 5.22 % K 6.29 % K2O |
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Aluminum 14.41 % Al 27.23 % Al2O3 |
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Arsenic 30.01 % As 46.03 % As2O5 |
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Hydrogen 2.29 % H 20.45 % H2O |
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Oxygen 48.07 % O |
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______ ______ |
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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 |
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PDF 34-670 |
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Alumopharmacosiderite Image |
Images:
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Alumopharmacosiderite Crystallography
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Cell Dimensions: |
a = 7.745, Z = 1; V = 464.58 Den(Calc)= 2.68 |
Crystal System: |
Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43m |
X Ray Diffraction: |
By Intensity(I/Io): 7.77(1), 2.739(0.6), 4.48(0.5), |
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Physical Properties of Alumopharmacosiderite
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Color: |
White. |
Diaphaneity: |
Transparent to Translucent |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Alumopharmacosiderite
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Gladstone-Dale: |
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2108,KC= 0.2128 Ncalc = 1.57 |
Optical Data: |
Isotropic, n=1.565. |
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Calculated Properties of Alumopharmacosiderite
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Electron Density: |
Bulk Density (Electron Density)=2.63 gm/cc note: Specific Gravity of Alumopharmacosiderite =2.68 gm/cc. |
Fermion Index: |
Fermion Index = 0.0002404233 Boson Index = 0.9997595767 |
Photoelectric: |
PEAlumopharmacosiderite = 20.85 barns/electron U=PEAlumopharmacosiderite x relectron= 54.77 barns/cc. |
Radioactivity: |
GRapi = 73.83 (Gamma Ray American Petroleum Institute Units)
Concentration of Alumopharmacosiderite per GRapi unit = 1.35 (%)
Estimated Radioactivity from Alumopharmacosiderite - barely detectable
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Alumopharmacosiderite Classification
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Dana Class: |
42.08.01.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.08)where (AB)7 (XO4)4 Zq � x(H2O) |
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(42.08.01)Pharmacosiderite Group |
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42.08.01.01 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m |
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42.08.01.02 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m |
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42.08.01.03 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m |
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42.08.01.04 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m |
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42.08.01.05 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m |
Strunz Class: |
08.DK.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1 |
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08.DK.10 Alumopharmacosiderite KAl4(AsO4)3(OH)4•6•5(H2O) P 43m 4 3m |
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08.DK.10 Barium-alumopharmacosiderite? BaAl4(AsO4)3(OH)5•5(H2O) P 43m ? 4 3m |
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08.DK.10 Bariopharmacosiderite BaFe4(AsO4)3(OH)5•5(H2O) I 42m 4 2m |
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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 |
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08.DK.10 Pharmacosiderite KFe4(AsO4)3(OH)4•6-7(H2O) I 43m 4 3m |
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08.DK.10 Natropharmacosiderite (Na,K)2Fe4(AsO4)3(OH)5•7(H2O) P 43m 4 3m |
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Other Alumopharmacosiderite Information
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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 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
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Print or Cut-and-Paste your Alumopharmacosiderite Specimen Label here :
Alumopharmacosiderite
KAl4(AsO4)3(OH)4•6•5(H2O)
Dana No: 42.08.01.02 Strunz No: 08.DK.10
Locality:
Notes:
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