If he’s 7 then I would recommend getting one of those books that has pretty photos of all the minerals and some diagrams of their structures too. Something like this. Minerals look amazing enough without getting into the abstraction of the chemistry and such, just seeing stunning photos of them all was motivation enough for my kid self to learn more.
Choosing places to actively go rock/mineral hunting is the other half to keeping him interested too, definitely keep that up!
If he’s 7 then I would recommend getting one of those books that has pretty photos of all the minerals and some diagrams of their structures too. Something like this. Minerals look amazing enough without getting into the abstraction of the chemistry and such, just seeing stunning photos of them all was motivation enough for my kid self to learn more.
Choosing places to actively go rock/mineral hunting is the other half to keeping him interested too, definitely keep that up!