For example , quartz is not found in basaltic phonolite , and olivine is not found in granite .
If grains of primary materials are not found in the parent material , it can be inferred that later additions occurred .
Quartz is not found in basaltic phonolite , and olivine is not found in granite .
If grains of primary materials are not found in the parent material , it can be inferred that later additions occurred .