1) Sodium mineral 
Mendozite is a sulfate mineral, one of the alum 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 min.....