Chalcoalumite
A valid IMA mineral species - grandfathered
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About Chalcoalumite
Formula:
CuAl4(SO4)(OH)12 · 3H2O
Colour:
Turquoise-green, pale blue, bluish-grey; colourless in transmitted light.
Lustre:
Vitreous, Sub-Vitreous, Dull
Hardness:
2½
Specific Gravity:
2.29
Crystal System:
Monoclinic
Member of:
Name:
In allusion to its composition, containing copper (CHALC-) and ALUMinum.
Chalcoalumite Group.
Compare also the chemically similar woodwardite.
A chalcoalumite-related, Sb-bearing mineral is described by Kolitsch et al. (2012). Its X-ray powder diffraction pattern is somewhat similar to that of chalcoalumite. The mineral may contain Sb(OH)6 groups replacing SO4 groups in the anionic interlayer.
Compare also the chemically similar woodwardite.
A chalcoalumite-related, Sb-bearing mineral is described by Kolitsch et al. (2012). Its X-ray powder diffraction pattern is somewhat similar to that of chalcoalumite. The mineral may contain Sb(OH)6 groups replacing SO4 groups in the anionic interlayer.
Unique Identifiers
Mindat ID:
961
Long-form identifier:
mindat:1:1:961:8
GUID
(UUID V4):
(UUID V4):
6eca13f9-80b8-46b8-b09b-90250362d483
IMA Classification of Chalcoalumite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1925
Classification of Chalcoalumite
7.DD.75
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
D : With only medium-sized cations; sheets of edge-sharing octahedra
31.3.1.1
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)Zq·xH2O
31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)5(XO4)Zq·xH2O
25.2.19
25 : Sulphates
2 : Sulphates of Cu and Ag
25 : Sulphates
2 : Sulphates of Cu and Ag
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Symbol | Source | Reference |
---|---|---|
Cca | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Ccm | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Chalcoalumite
Vitreous, Sub-Vitreous, Dull
Transparency:
Transparent, Translucent
Comment:
Outer layers of structures are vitreous.
Colour:
Turquoise-green, pale blue, bluish-grey; colourless in transmitted light.
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Sectile
Cleavage:
Distinct/Good
Several perfect probable. {100}
Several perfect probable. {100}
Density:
2.29 g/cm3 (Measured) 2.25 g/cm3 (Calculated)
Optical Data of Chalcoalumite
Type:
Biaxial (+)
RI values:
nα = 1.520 nβ = 1.520 nγ = 1.530
Birefringence:
0.01
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
relatively strong r
Optical Extinction:
Y = b; Z ∧ c = 22°.
Pleochroism:
Weak
Comments:
X = pale green; Y = colorless; Z = robin's egg blue.
Comments:
2V small.
Chemistry of Chalcoalumite
Mindat Formula:
CuAl4(SO4)(OH)12 · 3H2O
Crystallography of Chalcoalumite
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Cell Parameters:
a = 17.09 Å, b = 8.92 Å, c = 10.22 Å
β = 95.88°
β = 95.88°
Ratio:
a:b:c = 1.916 : 1 : 1.146
Unit Cell V:
1,549.77 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Occurs as rather porous, botryoidal crusts comprised of minute, matted fibers. Relatively large, lath-like crystals coat the outsides of the structures.
Twinning:
Twinning of the laths sometimes apparent with the composition face parallel to the long edge and nearly normal to the flat face. These exhibit re-entrant angles, with symmetrical faces and extinction.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0019969 | Chalcoalumite | Hawthorne F C, Cooper M A (2013) The crystal structure of chalcoalumite: mechanisms of Jahn-Teller-driven distortion in [6]Cu2+-containing oxysalts Mineralogical Magazine 77 2901-2912 | 2013 | Bisbee, Arizona, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.502 Å | (100) |
7.898 Å | (22) |
5.100 Å | (13) |
6.71 Å | (9) |
6.39 Å | (6) |
6.10 Å | (8) |
5.45 Å | (8) |
5.10 Å | (13) |
4.786 Å | (22) |
4.57 Å | (9) |
4.31 Å | (6) |
4.250 Å | (91) |
4.178 Å | (23) |
3.85 Å | (3) |
3.71 Å | (5) |
3.50 Å | (6) |
3.34 Å | (5) |
3.18 Å | (9) |
3.06 Å | (9) |
2.822 Å | (5) |
2.726 Å | (8) |
2.633 Å | (8) |
2.585 Å | (7) |
2.520 Å | (11) |
Comments:
ICDD 25-1430. See also ICDD 8-142.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47b : [Sulfates and sulfites] | |
47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Chalcoalumite
General Appearance of Type Material:
Thin crusts.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA, number 87005–87008.
Natural History Museum, London, England, number 1961,27.
National Museum of Natural History, Washington, D.C., USA, numbers 95226, R6326.
Natural History Museum, London, England, number 1961,27.
National Museum of Natural History, Washington, D.C., USA, numbers 95226, R6326.
Associated Minerals at Type Locality:
Other Language Names for Chalcoalumite
German:Chalcoalumit
Chalkoalumit
Chalkoalumit
Spanish:Chalcoalumita
Relationship of Chalcoalumite to other Species
Member of:
Other Members of this group:
Kyrgyzstanite | ZnAl4(SO4)(OH)12 · 3H2O | Mon. 2/m |
Mbobomkulite | (Ni,Cu)Al4((NO3)2,SO4)(OH)12 · 3H2O | Mon. 2 : P21 |
Nickelalumite | NiAl4(SO4)(OH)12(H2O)3 | Mon. 2/m |
Common Associates
Associated Minerals Based on Photo Data:
92 photos of Chalcoalumite associated with Azurite | Cu3(CO3)2(OH)2 |
84 photos of Chalcoalumite associated with Cyanotrichite | Cu4Al2(SO4)(OH)12 · 2H2O |
71 photos of Chalcoalumite associated with Brochantite | Cu4(SO4)(OH)6 |
61 photos of Chalcoalumite associated with Malachite | Cu2(CO3)(OH)2 |
40 photos of Chalcoalumite associated with Grandviewite | Cu3Al2(SO4)(OH)10 · H2O |
36 photos of Chalcoalumite associated with Cuprite | Cu2O |
29 photos of Chalcoalumite associated with Gypsum | CaSO4 · 2H2O |
25 photos of Chalcoalumite associated with Linarite | PbCu(SO4)(OH)2 |
22 photos of Chalcoalumite associated with Serpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
20 photos of Chalcoalumite associated with Gibbsite | Al(OH)3 |
Related Minerals - Strunz-mindat Grouping
7.DD. | Asagiite | NiCu4(SO4)2(OH)6 · 6H2O |
7.DD.05 | Felsőbányaite | Al4(SO4)(OH)10 · 4H2O |
7.DD.07 | Llantenesite | Cu6Al[SeO4](OH)12Cl · 3H2O |
7.DD.10 | Langite | Cu4(SO4)(OH)6 · 2H2O |
7.DD.10 | Posnjakite | Cu4(SO4)(OH)6 · H2O |
7.DD.10 | Wroewolfeite | Cu4(SO4)(OH)6 · 2H2O |
7.DD.10 | Gobelinite | CoCu4(SO4)2(OH)6 · 6H2O |
7.DD.10 | Fehrite | MgCu4(SO4)2(OH)6 · 6H2O |
7.DD.15 | Spangolite | Cu6Al(SO4)(OH)12Cl · 3H2O |
7.DD.15 | Kobyashevite | Cu5(SO4)2(OH)6 · 4H2O |
7.DD.15 | Unnamed (Dimorph of Devilline) | CaCu4(SO4)2(OH)6 · 3H2O |
7.DD.20 | Ktenasite | ZnCu4(SO4)2(OH)6 · 6H2O |
7.DD.25 | Christelite | Cu2Zn3(SO4)2(OH)6 · 4H2O |
7.DD.30 | Campigliaite | Mn2+Cu4(SO4)2(OH)6 · 4H2O |
7.DD.30 | Devilline | CaCu4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Orthoserpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Serpierite | Ca(Cu,Zn)4(SO4)2(OH)6 · 3H2O |
7.DD.30 | Niedermayrite | CdCu4(SO4)2(OH)6 · 4H2O |
7.DD.30 | Edwardsite | Cu3Cd2(SO4)2(OH)6 · 4H2O |
7.DD.35 | Carrboydite | (Ni1-xAlx)(SO4)x/2(OH)2 · nH2O |
7.DD.35 | Glaucocerinite | (Zn1-xAlx)(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Honessite | (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Hydrohonessite | (Ni1-xFe3+x)(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O |
7.DD.35 | Mountkeithite | [(Mg1-xFe3+x)(OH)2][SO4]x/2 · nH2O |
7.DD.35 | Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.35 | Wermlandite | Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O |
7.DD.35 | Woodwardite | Cu1-xAlx(OH)2(SO4)x/2 · nH2O |
7.DD.35 | Zincaluminite | Zn6Al6(SO4)2(OH)16 · 5H2O |
7.DD.35 | Hydrowoodwardite | (Cu1-xAlx)(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Zincowoodwardite | Zn1-xAlx(OH)2[SO4]x/2 · nH2O |
7.DD.35 | Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.35 | Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O |
7.DD.40 | Isselite | Cu6(SO4)(OH)10 · 5H2O |
7.DD.40 | Lawsonbauerite | (Mn2+,Mg)9Zn4(SO4)2(OH)22 · 8H2O |
7.DD.40 | Torreyite | (Mg,Mn2+)7◻2Mn2+2Zn4(SO4)2(OH)22 · 8H2O |
7.DD.45 | Mooreite | Mg9◻2Mn2Zn4(SO4)2(OH)26 · 8H2O |
7.DD.45 | Hodgesmithite | (Cu,Zn)6Zn(SO4)2(OH)10 · 3H2O |
7.DD.47 | Lahnsteinite | Zn4(SO4)(OH)6 · 3H2O |
7.DD.50 | Namuwite | Zn4(SO4)(OH)6 · 4H2O |
7.DD.50 | Minohlite | (Cu,Zn)7(SO4)2(OH)10 · 8H2O |
7.DD.52 | Lauraniite | Cu6Cd2(SO4)2(OH)12 · 5H2O |
7.DD.55 | Bechererite | Zn7Cu(OH)13[(SiO(OH)3(SO4)] |
7.DD.60 | Ramsbeckite | (Cu,Zn)15(SO4)4(OH)22 · 6H2O |
7.DD.65 | Vonbezingite | Ca6Cu3(SO4)3(OH)12 · 2H2O |
7.DD.70 | Redgillite | Cu6(SO4)(OH)10 · H2O |
7.DD.75 | Nickelalumite | NiAl4(SO4)(OH)12(H2O)3 |
7.DD.75 | Kyrgyzstanite | ZnAl4(SO4)(OH)12 · 3H2O |
7.DD.80 | Guarinoite | Zn6(SO4)(OH)10 · 5H2O |
7.DD.80 | Schulenbergite | (Cu,Zn)7(SO4)2(OH)10 · 3H2O |
7.DD.80 | Thérèsemagnanite | NaCo4(SO4)(OH)6Cl · 6H2O |
7.DD.80 | UM1992-30-SO:CCuHZn | (Zn,Cu)7(SO4,CO3)2(OH)10 · 3H2O |
7.DD.85 | Montetrisaite | Cu6(SO4)(OH)10 · 2H2O |
Fluorescence of Chalcoalumite
Not fluorescent in UV.
Other Information
Notes:
Slowly soluble in cold dilute acids, easily soluble in hot acids.
Observed altered to gibbsite.
Observed altered to gibbsite.
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 Chalcoalumite
mindat.org URL:
https://www.mindat.org/min-961.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Chalcoalumite
Localities for Chalcoalumite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Day et al. (1996) |
| Bottrill et al. (2008) |
Austria | |
| G. Blass (2001) |
| Niedermayr et al. (1995) |
Puttner | |
| Mikl et al. (2014) |
| Kolitsch et al. (2014) |
| Brandstätter et al. (2010) |
| Kolitsch (2014) |
| U. Kolitsch et al. (2012) |
| U.Kolitsch 2011 +1 other reference |
| Kolitsch et al. (2011) |
| C.Auer (2013) |
| Gröbner et al. (2012) |
| Kolitsch (2014) |
Belgium | |
| Ottenburgs et al. (1998) |
| van Tassel et al. (1979) |
| BLONDIEAU M. et al. (2017) |
du Ry et al. (1976) +1 other reference | |
du Ry et al. (1976) +2 other references | |
| |
Bulgaria | |
| Bulgarian Academy of Sciences Annual ... |
Canada | |
| Peatfield (n.d.) +1 other reference |
| Sabina (1991) |
Chile | |
| Samples analysed by Dr. Jochen Schlüter (Hamburg University) |
| Luigi Mattei specimen |
| Samples analysed by Dr. Jochen Schlüter (Hamburg University) +1 other reference |
Czech Republic | |
| Jakub Plasil |
France | |
| Germain C. et al. (1990) |
| Lheur (2023) |
| Georges Favreau collection |
Germany | |
| Weiß (1990) |
| Schellhorn et al. (1989) |
| Bender et al. (1994) |
| Matthias Reinhardt (2011) |
Mineralien-Welt 6/2007 | |
| Henrich (2010) |
| Reinhardt (1997) +1 other reference |
| Wittern (2001) |
| Henrich (2010) |
| Henrich (2009) |
| Henrich (2010) |
Henrich & Reinhardt (2008) +1 other reference | |
| Henrich (2010) |
| Habel et al. (2009) |
| Wittern (2001) |
| Reinhardt & Henrich (2005) +1 other reference |
| Henrich (2010) |
Henrich (2010) | |
| Henrich (2010) |
| Lapis 38 (5) +1 other reference |
| Gröbner et al. (2011) |
| Möhn et al. (10/2020) |
| Gröbner J. et al. (2006) |
Lapis 30 (7/8) | |
Greece | |
| Wendel (2000) +1 other reference |
| |
Gröbner (2001) | |
Italy | |
| analysed by Dr. Anthony Kampf |
| Palenzona et al. (1988) |
| Piccoli et al. (2007) |
| Ciriotti et al. (2019) |
| Ciriotti et al. (2007) |
| Campostrini et al. (1999) +1 other reference |
| Bardi et al. (2017) +1 other reference |
Sabelli C. et al. (GR) | |
| Domenico Saccardo (2019) |
Domenico Saccardo (2019) | |
Japan | |
| Matsubara et al. (2006) |
| Kojiro (1999) |
Lebanon | |
| Kruszewski et al. (South Lebanon) |
Poland | |
| Siuda (2001) |
Portugal | |
| Pedro Alves collection and analytical ... |
Romania | |
| www.minerals-of-the-carpathians |
| Editor:Szakáll |
Slovakia | |
| Sejkora (1993) |
| Ďuda et al. (2012) |
South Africa | |
| Martini (1997) |
Cairncross et al. (1995) | |
Spain | |
| Calvo Rebollar et al. (2022) |
| Valladares et al. (2021) |
Valladares et al. (2021) | |
| Mineralogistes de Catalunya (2/3) |
Sweden | |
| Natural History Museum |
| |
| Persson (2006) |
| Mineralogical Society of America - ... |
Switzerland | |
| Ansermet (2012) |
UK | |
| Ansermet (2007) |
| The Russel Society |
| Golley et al. (1995) +1 other reference |
| Braithwaite et al. (1982) |
| Camm (1993) +1 other reference |
| Bevins et al. (1985) |
| Day (1999) |
USA | |
| Min.Rec.: 12: 299 +4 other references |
King (n.d.) | |
| Palache et al. (1951) |
King (n.d.) | |
| Richard Graeme personal communications. +2 other references |
| Williams (1971) +1 other reference |
| Luetcke (n.d.) |
| Luetcke (n.d.) |
Luetcke (n.d.) | |
| Leicht (1971) +1 other reference |
| |
| Luetcke (n.d.) |
| Eckel et al. (1997) |
| Castor et al. (2004) |
Thorne (n.d.) | |
| Peter Chin |
Peter Chin | |
| Virgil Lueth |
| Thorne (n.d.) |
| Anatoly Kasatkin analyses |
| Rocks & Minerals 83:1 pp 52-62 |
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Grandview Mine, Horseshoe Mesa, Grandview Mining District, Coconino County, Arizona, USA