Bicarbonate is not a mineral. It is part of the salts contained in carbonic acid – it is a very typical substance in mineral waters that have permeated limestone stratum, such as dolomite. Bicarbonate has an acid neutralizing effect, effecting a pleasantly neutral and natural flavor of the mineral water. By nature Gerolsteiner Sparkling and Gerolsteiner Medium contain more than 1,800 mg/l of bicarbonate. This is why the Gerolsteiner mineral waters don't taste acidic but rather neutral and refreshing. Gerolsteiner Naturell contains 577 milligrams per liter.
More about bicarbonate can be found here.
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