Chloraluminite
Chloraluminite is an IMA-recognized mineral species in the halide class, with the chemical formula AlCl₃·6H₂O.
It crystallizes in the hexagonal crystal system (space group R-3c).
Key properties: specific gravity 1.644; optically uniaxial.
IMA symbol Cla, grandfathered status — known before the IMA’s founding, named in 1873.
Occurs as crusts around acidic fumaroles (Vesuvius, Italy).
It is found associated with Molysite, chloromagnesite (Vesuvius, Italy); natroalunite, gypsum, anhydrite, pickeringite (Cerro Pintados, Chile).
The name refers to CHLORine and ALUMINum in its composition.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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