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_0.66Fe³⁺₄(SO₄)₆(OH)₂•20(H₂O)

Environment:

Secondary mineral typically formed by the oxidation of pyrite in shales and coal; may be a fumarolic reaction product.

IMA Status:

Valid Species (Pre-IMA) 1947

Locality:

"Temple Rock", [probably the Temple Mountain district, Emery Co.,] Utah; at Island Mountain, Trinity Co., and the Champion mine, White Mountains, Mono Co., California, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its content of aluminum and relation to the copiapite group.

Name Pronunciation:

Aluminocopiapite

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 - Pinacoidal H-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.

Diaphaneity:

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
Ncalc = 1.58

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:

Bulk Density (Electron Density)=2.23 gm/cc
note: Specific Gravity of Aluminocopiapite =2.18 gm/cc.

Fermion Index:

Fermion Index = 0.0053943924
Boson Index = 0.9946056076

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Aluminocopiapite is Not Radioactive

Aluminocopiapite Classification

Dana Class:

31.10.05.07 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.05)Copiapite Group

31.10.05.01 Copiapite FeFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.02 Magnesiocopiapite MgFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.03 Cuprocopiapite CuFe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.04 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2•20(H2O) P1 1

31.10.05.05 Calciocopiapite CaFe4(SO4)6(OH)2•19(H2O) P1 1

31.10.05.06 Zincocopiapite ZnFe4(SO4)6(OH)2•18(H2O) P1 1

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

Strunz Class:

07.DB.35 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DB -With only medium-sized cations; insular octahedra and finite groups

07.DB.35 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2•20(H2O) P1 1

07.DB.35 Copiapite FeFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Calciocopiapite CaFe4(SO4)6(OH)2•19(H2O) P1 1

07.DB.35 Cuprocopiapite CuFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Magnesiocopiapite MgFe4(SO4)6(OH)2•20(H2O) P1 1

07.DB.35 Zincocopiapite ZnFe4(SO4)6(OH)2•18(H2O) P1 1

Other Aluminocopiapite Information

References:

NAME( AntBidBlaNic5) 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Aluminocopiapite

Al2/3Fe+++4(SO4)6O(OH)2•20(H2O)
Dana No: 31.10.05.07 Strunz No: 07.DB.35
Locality:

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