Occurance of Alkali earth Metals, mineral names and formulas.

Due to high reactivity, the alkali metals occur in nature in the combined state. None of the alkali metals is found free in nature. Sodium and potassium are abundant alkali metals and each constitute about 2.4% of earth's crust. Most of the earth's crust is composed of insoluble alumino-silicates of alkali metals.
Lithium deposits, usually in the form of complex minerals, are widely scattered over the earth. An important commercial source of lithium is the mineral spodumene, LiAl(SiO3)2.
Small Amount of rubidium and ceasium are found in potassium salts deposits. Francium has not been found in nature. It has been prepared artificially in the laboratory and is very unstable, so that a very little is known about this metal.

Common Minerals of the most Important Alkali Metals:

Lithium:

Spodumene: LiAl(SiO3)2

Sodium:

Rock salt (Halite): NaCl
Chile Saltpetre: NaNO3
Natron: Na2CO3.H2O
Trona: Na2CO3.2NaHCO3.2H2O
Borax: Na2B4O7.10H2O

Potassium:

Carnallite: KCl.MgCl2.6H2O
Sylvite: KCl
Alunite (Alum Stone) K2SO4.Al2(SO4)3.4Al(OH)3

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