Aluminocopiapite Mineral Data

Aluminocopiapite Mineral Data +

General Aluminocopiapite Information

Chemical Formula:

Al2/3Fe+++4(SO4)6O(OH)2·20(H2O)

Composition:

Molecular Weight = 1,212.08 gm

Aluminum 1.48 % Al 2.80 % Al₂O₃

Iron 18.43 % Fe 26.35 % Fe₂O₃

Hydrogen 3.49 % H 31.21 % H₂O

Sulfur 15.87 % S 39.63 % SO₃

Oxygen 60.72 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al_0.6666Fe³⁺₄(SO₄)₆(OH)₂·20(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1947

Locality:

Link to MinDat.org Location Data.

Aluminocopiapite Image

Images:

Aluminocopiapite

Comments: Small yellow crystals of aluminocopiapite.
Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Aluminocopiapite Crystallography

Axial Ratios:

a:b:c =0.3992:1:0.4001

Cell Dimensions:

a = 7.251, b = 18.161, c = 7.267, Z = 1; alpha = 93.983°, beta = 102.283°, gamma = 97.966° V = 923.79 Den(Calc)= 2.18

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.2(1), 5.58(0.8), 18.1(0.8),

Physical Properties of Aluminocopiapite

Color:

Yellow.

Diaphaniety:

Transparent to Translucent

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Earthy (Dull)

Streak:

light yellow

Optical Properties of Aluminocopiapite

Gladstone-Dale:

CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2521,KC= 0.2651

Optical Data:

Biaxial (+), a=1.529, b=1.535, g=1.585, bire=0.0560, 2V(Calc)=40, 2V(Meas)=45.

Calculated Properties of Aluminocopiapite

Electron Density:

r_electron=2.23 gm/cc
note: r_{Aluminocopiapite}=2.18 gm/cc.

Fermion Index

Fermion Index = 0.00539
Boson Index = 0.99461

Photoelectric:

PE_{Aluminocopiapite}= 6.36 barns/electron
U=PE_{Aluminocopiapite} x r_electron= 14.15 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aluminocopiapite is Not Radioactive

Aluminocopiapite Classification

Dana Class:

31.10.5.7 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.5)Copiapite Group

31.10.5.1 Copiapite FeFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.2 Magnesiocopiapite MgFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.3 Cuprocopiapite CuFe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.4 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2·20(H2O) P1 1

31.10.5.5 Calciocopiapite CaFe4(SO4)6(OH)2·19(H2O) P1 1

31.10.5.6 Zincocopiapite ZnFe4(SO4)6(OH)2·18(H2O) P1 1

31.10.5.7 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2·20(H2O) P1 1

Strunz Class:

VI/D.10-80 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.10 - Copiapite group, Botryogen - Chaidamuite

VI/D.10-10 Botryogen MgFe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-20 Zincobotryogen (Zn,Mg,Mn)Fe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-30 Calciocopiapite CaFe4(SO4)6(OH)2·19(H2O) P1 1

VI/D.10-40 Magnesiocopiapite MgFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-50 Copiapite FeFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-60 Cuprocopiapite CuFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-70 Zincocopiapite ZnFe4(SO4)6(OH)2·18(H2O) P1 1

VI/D.10-80 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2·20(H2O) P1 1

VI/D.10-90 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-100 Guildite CuFe(SO4)2(OH)·4(H2O) P 2₁/m 2/m

VI/D.10-110 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)·4(H2O) P1 1

Other Aluminocopiapite 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 Aluminocopiapite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Aluminocopiapite

Al2/3Fe+++4(SO4)6O(OH)2·20(H2O)
Dana No: 31.10.5.7 Strunz No: VI/D.10-80
Locality:

Notes: