Questions for the sims 3 on xbox 360.?

Question 1: where do i find the omni plant seed? Question 2: where do i find the most exspensive metal? its called like polltium or something. i have spent hours looking for one on every location and even at diff times. please help on this. i think its worth like $1500. Question 3: how long does it take for rocks and metals to spawn after i take them?