Aluminocopiapite (original) (raw)
A valid IMA mineral species - grandfathered
About AluminocopiapiteHide
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Formula:
Al2/3Fe3+4(SO4)6(OH)2 · 20H2O
Colour:
Pale lemon-yellow to deep yellow
Specific Gravity:
2.163 (Calculated)
Name:
In allusion to its composition containing aluminum in substitution for ferric iron and its relationship to copiapite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:87:7
4a0df0c1-0139-40fc-9f17-eff58cfe1a02
IMA Classification of AluminocopiapiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(Al,Mg)Fe3+4(SO4)6(OH,O)2 · 20H2O
Classification of AluminocopiapiteHide
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7.DB.35
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
B : With only medium-sized cations; insular octahedra and finite units
31.10.5.7
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
10 : Miscellaneous
25.11.25
25 : Sulphates
11 : Sulphates of Fe and other metals
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Acpi | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of AluminocopiapiteHide
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Transparency:
Transparent, Translucent
Colour:
Pale lemon-yellow to deep yellow
Comment:
By analogy to copiapite group
Cleavage:
Perfect
Perfect on {010}; imperfect on {101}
Density:
2.163 g/cm3 (Calculated)
Optical Data of AluminocopiapiteHide
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RI values:
_n_α = 1.525 _n_β = 1.535 - 1.540 _n_γ = 1.585 - 1.590
2V:
Measured: 45° , Calculated: 40°
δ = 0.060 - 0.065
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
Y = colorless; Z= greenish yellow.
Chemistry of AluminocopiapiteHide
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Mindat Formula:
Al2/3Fe3+4(SO4)6(OH)2 · 20H2O
Crystallography of AluminocopiapiteHide
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Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 7.3(1) Å, b = 18.8(2) Å, c = 7.31(1) Å
α = 91.5(2)°, β = 102.3(1)°, γ = 98.7(1)°
Ratio:
a:b:c = 0.388 : 1 : 0.389
Unit Cell V:
967.14 ų (Calculated from Unit Cell)
Morphology:
As minute scales and efforvescences.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.2 Å | (100) |
| 18.1 Å | (80) |
| 5.58 Å | (80) |
| 6.17 Å | (70) |
| 3.58 Å | (50) |
| 3.50 Å | (50) |
| 5.32 Å | (30) |
Comments:
Magnesium-rich. Forty Mile River, Alaska, USA. Data from Jolly and Foster (1967).
Geological EnvironmentHide
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Geological Setting:
Secondary mineral formed by oxidation of pyrite in coal deposits and shales. May also be of fumarolic origin.
Type Occurrence of AluminocopiapiteHide
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Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 93834, 103544.
Other Language Names for AluminocopiapiteHide
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Relationship of Aluminocopiapite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Notes:
Somewhat soluble in water.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for AluminocopiapiteHide
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References for AluminocopiapiteHide
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Reference List:
Localities for AluminocopiapiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.