But caution is warranted.Quartz can form in the last stages of magma crystallization even if the parent rock is not granitic, although such quartz is much less abundant.

• 然而，必须谨慎的是，即使母岩不是花冈岩，在岩浆结晶的最后阶段仍然可以形成石英，只不过含量少得多。