Have you tried any cheap jewellers or Argos?
Psi Centauri B 3
Electra 3
Sigma Lupi C 3
Fine Ring Sector IR-W D1-9 C 3
Electra 3 is definitely one where you just blast it out of the rocks. There are also some automated mining stations that can be blasted and their minerals robbed (for cargo).Are any of those barnacles, or are they just planets where you can find outcroppings or meteorites that contain Zirconium? thanks!