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

Alumopharmacosiderite Image

Images:

Alumopharmacosiderite

Comments: Minute white specks of alumopharmacosiderite, with tan olivenite and unknown orange material.
Location: Gold Hill, Gold Hill District (Clifton District), Deep Creek Mts, Tooele Co., Utah, USA. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

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.

Diaphaneity:

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
Ncalc = 1.57

Optical Data:

Isotropic, n=1.565.

Calculated Properties of Alumopharmacosiderite

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:

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)
Concentration of Alumopharmacosiderite per GRapi unit = 1.35 (%)

Estimated Radioactivity from Alumopharmacosiderite - barely detectable

Alumopharmacosiderite Classification

Dana Class:

42.08.01.02 (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

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 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 - 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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Alumopharmacosiderite

KAl4(AsO4)3(OH)4•6•5(H2O)
Dana No: 42.08.01.02 Strunz No: 08.DK.10
Locality:

Notes: