Is quartz a molecule

No, quartz is a Silicate mineral.

------edit by someone named koca-----

i'm sorry to edit but it's wrooong, quarts is both a silicate mineral and a polymer, the two are not mutually exclusive

polymers are normally associated with plastics, but any chemical structure formed by the repetition of a simpler smaller structure called monomer (which in the case of quarts is silicate tetrahedrons) is a polymer