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 % Al2 O3
Iron 18.43 % Fe 26.35 % Fe2 O3
Hydrogen 3.49 % H 31.21 % H2 O
Sulfur 15.87 % S 39.63 % SO3
Oxygen 60.72 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Al0.66 Fe3+ 4 (SO4 )6 (OH)2 •20(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEAluminocopiapite = 6.36 barns/electronU=PEAluminocopiapite x r Electron 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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