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Aluminocoquimbite

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About AluminocoquimbiteHide

Formula:
Al2Fe2(SO4)6(H2O)12·6H2O
formerly given as FeAl(SO4)3.9H2O; in course of the IMA redefinition and to better address its relation to coquimbite, the newly-accepted formula is a multiplication of the former.
Colour:
Colourless to pale pink
Specific Gravity:
2.03
Crystal System:
Trigonal
Name:
Named for the relation to coquimbite and its elevated Al content.
Visually indistinguishable from coquimbite.

The structure differs from that of coquimbite in occuppancy of the three non-equivalent octahedral metal sites, and content of the coordination sphere of these three sites. M(1) and M(2) sites are occupied by Fe, surrounded exclusively by oxygen atoms belonging to the sulphate groups. M(3) site is occupied by Al, which forms isolated Al(H2O)6 octahedron. Fe(1) and Fe(2) octahedra share corners with sulfate tetrahedra; these Fe sites alternate to form infinite Fe(SO4)3 columns along [001], resembling columns in ferrinatrite. There is a hydrogen-bond linkage between these columns and Al-bearing octahedra, which provides cages hosting six water molecules. Interestingly, as in coquimbite, these water molecules are arranged in a cyclohexane-like chair motif.


Classification of AluminocoquimbiteHide

Approved
Approval Year:
2009
Approval History:
redefinition code: IMA-19F
7.CB.50

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
29.8.8.

29 : HYDRATED ACID AND NORMAL SULFATES
8 : A2(XO4)3·H2O

Physical Properties of AluminocoquimbiteHide

Colour:
Colourless to pale pink
Density:
2.03 g/cm3 (Measured)    2.044 g/cm3 (Calculated)

Optical Data of AluminocoquimbiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.530 nε = 1.560
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of AluminocoquimbiteHide

Formula:
Al2Fe2(SO4)6(H2O)12·6H2O

formerly given as FeAl(SO4)3.9H2O; in course of the IMA redefinition and to better address its relation to coquimbite, the newly-accepted formula is a multiplication of the former.
IMA Formula:
AlFe(SO4)3 · 9H2O

Crystallography of AluminocoquimbiteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3 1c
Cell Parameters:
a = 10.7065(7) Å, c = 17.3077(11) Å
Ratio:
a:c = 1 : 1.617
Unit Cell V:
1718.2 ų
Z:
4
Comment:
Space group identical with that of coquimbite, but structure is different.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.251 Å(100)
5.310 Å(110)
3.152 Å(43)
4.087 Å(33)
1.765 Å(20)
2.112 Å(17)

Type Occurrence of AluminocoquimbiteHide

Synonyms of AluminocoquimbiteHide

Relationship of Aluminocoquimbite to other SpeciesHide

Other Members of this group:
CoquimbiteAlFe3(SO4)6(H2O)12·6H2OTrig. 3m (3 2/m) : P3 1c
ParacoquimbiteFe4(SO4)6(H2O)12· 6H2OTrig. 3 : R3

Related Minerals - Nickel-Strunz GroupingHide

7.CB.05Dwornikite(Ni,Fe)SO4 · H2OMon. 2/m : B2/b
7.CB.05GunningiteZnSO4 · H2OMon. 2/m : B2/b
7.CB.05KieseriteMgSO4 · H2OMon. 2/m
7.CB.05Poitevinite(Cu,Fe)SO4 · H2OTric.
7.CB.05SzmikiteMnSO4 · H2OMon.
7.CB.05SzomolnokiteFeSO4 · H2OMon. 2/m : B2/b
7.CB.05CobaltkieseriteCoSO4 · H2OMon. 2/m : B2/b
7.CB.07SanderiteMgSO4 · 2H2OOrth. 2 2 2 : P21 21 21
7.CB.10BonattiteCuSO4 · 3H2OMon.
7.CB.15Aplowite(Co,Mn,Ni)SO4 · 4H2OMon. 2/m
7.CB.15Boyleite(Zn,Mg)SO4 · 4H2OMon. 2/m : P21/b
7.CB.15Ilesite(Mn,Zn,Fe)SO4 · 4H2OMon. 2/m
7.CB.15RozeniteFeSO4 · 4H2OMon. 2/m : P21/b
7.CB.15StarkeyiteMgSO4 · 4H2OMon. 2/m : P21/b
7.CB.15DrobeciteCdSO4 · 4H2OMon. 2/m : P21/m
7.CB.15CranswickiteMgSO4 · 4H2OMon. m : Bb
7.CB.20ChalcanthiteCuSO4 · 5H2OTric. 1 : P1
7.CB.20JôkokuiteMnSO4 · 5H2OTric.
7.CB.20PentahydriteMgSO4 · 5H2OTric.
7.CB.20SiderotilFeSO4 · 5H2OTric.
7.CB.25Bianchite(Zn,Fe)SO4 · 6H2OMon. 2/m : P2/m
7.CB.25Chvaleticeite(Mn,Mg)SO4 · 6H2OMon. 2/m : B2/b
7.CB.25FerrohexahydriteFeSO4 · 6H2OMon. 2/m : B2/b
7.CB.25HexahydriteMgSO4 · 6H2OMon. 2/m : P2/m
7.CB.25Moorhouseite(Co,Ni,Mn)SO4 · 6H2OMon.
7.CB.25Nickelhexahydrite(Ni,Mg,Fe)SO4 · 6H2OMon.
7.CB.30RetgersiteNiSO4 · 6H2OTet. 4 2 2 : P41 21 2
7.CB.35BieberiteCoSO4 · 7H2OMon. 2/m : P2/m
7.CB.35BoothiteCuSO4 · 7H2OMon.
7.CB.35MallarditeMnSO4 · 7H2OMon. 2/m : P2/m
7.CB.35MelanteriteFe2+(H2O)6SO4 · H2OMon. 2/m : P21/b
7.CB.35Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2OMon.
7.CB.35AlpersiteMg(SO4) · 7H2OMon. 2/m : P21/b
7.CB.40EpsomiteMgSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40GoslariteZnSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.40MorenositeNiSO4 · 7H2OOrth. 2 2 2 : P21 21 21
7.CB.45AlunogenAl2(SO4)3 · 17H2OTric. 1
7.CB.45Meta-alunogenAl2(SO4)3 · 12H2O
7.CB.55CoquimbiteAlFe3(SO4)6(H2O)12·6H2OTrig. 3m (3 2/m) : P3 1c
7.CB.55ParacoquimbiteFe4(SO4)6(H2O)12· 6H2OTrig. 3 : R3
7.CB.55Rhomboclase(H5O2)Fe3+(SO4)2 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
7.CB.60KorneliteFe2(SO4)3 · 7H2OMon. 2/m : P21/m
7.CB.65QuenstedtiteFe2(SO4)3 · 11H2OTric. 1 : P1
7.CB.70LauseniteFe2(SO4)3·5H2OMon. 2/m : P21/m
7.CB.75LishizheniteZnFe2(SO4)4 · 14H2OTric. 1 : P1
7.CB.75RömeriteFe2+Fe3+2(SO4)4 · 14H2OTric. 1 : P1
7.CB.80RansomiteCuFe2(SO4)4 · 6H2OMon. 2/m : P21/b
7.CB.85ApjohniteMn2+Al2(SO4)4 · 22H2OMon.
7.CB.85BíliniteFe2+Fe3+2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Dietrichite(Zn,Fe2+,Mn2+)Al2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85HalotrichiteFeAl2(SO4)4 · 22H2OMon. 2 : P2
7.CB.85PickeringiteMgAl2(SO4)4 · 22H2OMon. 2/m : P21/b
7.CB.85Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2OMon.
7.CB.85Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2OMon.
7.CB.90MeridianiiteMgSO4 · 11H2OTric. 1 : P1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AluminocoquimbiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Demartin, F., Castellano, C., Gramaccioli, C.M., Campostrini, I. (2010): Aluminum-for-iron substitution, hydrogen bonding, and a novel structure-type in coquimbite-like minerals. Canadian Mineralogist: 48: 323-333.
Demartin, F., Castellano, C., Gramaccioli, C.M., Campostrini, I. (2010): Aluminocoquimbite, AlFe(SO4)3•9H2O, a new aluminium iron sulfate from Grotta dell'Allume, Vulcano, Aeolian Islands, Italy. The Canadian Mineralogist: 48(6): 1465-1468
J. Majzlan, T. Đjorđjević, U. Kolitsch & J. Schefer (2010): Hydrogen bonding in coquimbite, nominally Fe2(SO4)3•9H2O, and the relationship between coquimbite and paracoquimbite. Mineral. Petrol.: 100: 241-248.
Miyawaki, R., Hatert, F., Pasero, M., Mills, S.J. (2019): New minerals approved by IMA CNMNC in Octber and November 2019. Newsletter 52. IMA 19-E: Revalidation of dienerite; http://forum.amiminerals.it/viewtopic.php?f=5&t=15946

Internet Links for AluminocoquimbiteHide

Localities for AluminocoquimbiteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy
 
  • Campania
    • Naples
      • Pozzuoli
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
            • Porto Levante
              • Faraglioni di Levante (Grotte dei Faraglioni; Grotte del Faraglione; "Grotte de Faraglione")
                • Faraglione Nico (Faraglione Piccolo; Faragghiune Nicu)
Demartin, F., Castellano, C., Gramaccioli, C.M., Campostrini, I. (2010): Aluminum-for-iron substitution, hydrogen bonding, and a novel structure-type in coquimbite-like minerals. Canadian Mineralogist, 48, 323-333.
Lebanon
 
  • South Governate
    • Jezzine District
Kruszewski, Ł., 2018/2019. Secondary sulfate minerals from Bhanine valley coals (South Lebanon) – a crystallochemical and geochemical study. Geological Quarterly (in press)
USA
 
  • Utah
    • San Juan Co.
      • Red Canyon
Joe Marty (2015) Minerals of the Blue Lizard Mine and other Western Localities, NCMA Annual Symposium 2015
 
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