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AlCl3 · 6H2O
Colourless to white; ...
In allusion to the composition, containing CHLORine and ALUMINium.
A deliquescent, hydrated chloride mineral.

Classification of Chloraluminite

Approved, 'Grandfathered' (first described prior to 1959)

B : Simple halides, with H2O
C : M:X = 1:3

3 : AX3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al

Physical Properties of Chloraluminite

Colourless to white; yellowish; colourless in transmitted light.

Optical Data of Chloraluminite

Uniaxial (-)
RI values:
nω = 1.560 nε = 1.507
Max Birefringence:
δ = 0.053
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Chloraluminite

AlCl3 · 6H2O
Elements listed in formula:

Crystallography of Chloraluminite

Crystal System:
Cell Parameters:
a = 11.83 Å, c = 11.91 Å
a:c = 1 : 1.007
Unit Cell Volume:
V 1,443.48 ų (Calculated from Unit Cell)
Occurs in crystalline crusts and stalactites. Rhombohedral (natural crystals); prismatic [0001] (artificial crystals).

Type Occurrence of Chloraluminite

Associated Minerals at Type Locality:

Relationship of Chloraluminite to other Species

8.6.3CadwaladeriteAlCl(OH)2 · 4H2O
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O x about 1.75
8.6.12GearksutiteCaAlF4(OH) · H2O
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2O
8.6.15CarlhintzeiteCa2AlF7 · H2O
8.6.17ThomsenoliteNaCaAlF6 · H2O
8.6.18PachnoliteNaCaAlF6 · H2O
8.6.19Zirklerite(Fe,Mg)9Al4Cl18(OH)12 · 14H2O

Other Names for Chloraluminite

Name in Other Languages:

Other Information

Thermal Behaviour:
Decomposes at a low tempeature.
Other Information:
Deliquescent. Very 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.

References for Chloraluminite

Reference List:
Scacchi, A. (1874) Reale accademia delle scienze fisische e matematiche, Naples, Att.: 6, no. 9: 43, 68 (as Chloralluminio).

vom Rath (1877) Verh. naturhist. Ver. Rheinland: 34: 152.

Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York.: 165.

Gill, In: Dennis (1895) Zeitschrift für anorganische und allgemeine Chemie, Hamburg, Leipzig: 9: 340.

Lacroix (1907) Bulletin de la Société française de Minéralogie: 30: 254.

Takahashi, et al (1928) Journal of the Geological Society of Tokyo: 35: 439.

Andress and Carpenter (1934) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 87: 446.

Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 51.

Acta Crystallographica: B24:954.

Acta Crystallographica: B27: 1069-1070.

Internet Links for Chloraluminite URL:
Please feel free to link to this page.

Localities for Chloraluminite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
  • Western Antarctica
    • Antarctic Peninsula
      • South Shetland Islands
Viramonte, J.G., Sureda, R.J., Bossi, G.E., Fourcade, N.H., Omarini, R.H., Geochemical and mineralogical study of the high temperature fumaroles from Decepcion Island, South Shetland, Antarctica. Inst. Assoc. of Volc. and chemistry of the erath interior. Symposium Andean and Antarctic Volcanology Problems. Chile (1974).
  • Grand Est
    • Bas-Rhin
      • Obernai
Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997
Italy (TL)
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 50.
  • Upper Silesia (Śląskie)
    • Upper Silesian Coal Basin
      • Rybnik Coal Area
        • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40
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