Stones

From BoardGameGeek:

It's put-and-take meets nine-men's-morris...sort of. Players progress around the playing field collecting stones and placing them into a grid...and sometimes removing them for strategic reasons. This is a game for all ages, and included in each package is a chart of the actual minerals depicted on the board. (Fun and educational!) A favorite with groups of mixed ages, with an element of strategy as well as of chance. Stones has proven to be a popular “filler” for game groups, as well as a great game for the pre-teen crowd.