Is this common in crystals?
Typically excess silica is needed in the magma to allow the formation of quartz (quartz forms from the silica that wasn't consumed in the formation of the other minerals). Olivine is less saturated with respect to silica than other iron-magnesium silicates (such as pyroxenes and amphiboles) and thus either these more saturated minerals will form directly, or when olivine is formed, it will react with the surrounding magma into these more saturated forms if there is excess silica present.. Neither pegmatites or aphanites (aphanitic rocks) form from multi-stage cooling. The term for rocks that have slow partial cooling followed by rapid quenching is porphyry. Aphanites form from rapid cooling of the magma, which prevents the formation of large crystals. Pegmatites form from slow cooling, frequently in the presence of a water phase that aids crystal formation, resulting in very large crystals.
Many diamonds have internal traces of olivine trapped within them for the most part , Depending on the creation point and the surrounding enviorment I would imagine anything is possible.Quartz is always found in igneous for the most part in basically two different stages , one directly from the magma or hydro thermally after cooling.I think the answer to your question would be pegmatitic.
Yes it can as a secondary deposit ! and i think pegmatitic i would need to look that up in my books ! I cut my wone stones !
