Sodium starts row 3 (Period 3) on the periodic table.
Sodium Minerals - Most Sodium minerals are ionic compounds (salts).
My APEX mineral definition excludes salts but I couldn't resist. Sodium Chloride is almost top dog as far as Sodium concentration and there are lots of beautiful cheap sample crystals to collect.
Sodium compounds are of immense commercial importance, being particularly central to industries producing glass, paper, soap, and textiles.
Salt was used as early as 3000 BC and brine as early as 6000 BC
Sodium is essential to all living organisms. It is critical to the regulation of fluid balances and acidity.