Why bubbles appear when you open a bottle of soda but not when you open a bottle of mineral water?

Soda is carbonated; it contains carbonic acid which becomes carbon dioxide gas and turns into bubbles, when it is not under pressure. Some mineral water is also carbonated. Perrier, for example, does have bubbles, although to a lesser extent than a typical soda. But mineral water varies. Different springs have different kinds of mineral content.