Speaking of quartz, let discuss the correlation between quartz and gold. Most people know that the two materials often run together, but they will use that as a reason to believe that the shiny rock that they just found is gold, simply because they found some quartz nearby.
Quartz is the second most abundant mineral on Earth. It comprises a significant percentage of the Earth crust, so simply finding some quartz and then assuming that there will be gold nearby is not very likely. There are thousands of quartz areas were no gold is present. Yes, sometimes gold and quartz are found together, but they are not dependent on each other.