Minerals identify

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Mendozite

Sulfate mineral, alum series

Mendozite is a sulfate series, with formula NaAl(SO4)2·11H2O. It is a hydrated form of sodium aluminium sulfate (soda alum).

It was discovered in western Argentina in 1868, probably near San Juan. The exact location has been lost, but was described as "San Juan, near Mendoza ", and it is the latter city that give the mineral its name., presumably from the oxidation of sulfide minerals It is very soluble in water, and so can only be found in dry regions: however, in can still effloresce (lose water of crystallisation) in extremely arid climates, altering (the hexahydrate).

Identification

Mohs scale ( mineral hardness )

3

The streak

White

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Monoclinic