* Geological context: "The granite is the parent rock from which the sandstone was derived through weathering and erosion."
* Metamorphic context: "The marble is a metamorphic rock formed from the parent rock limestone under intense heat and pressure."
* General context: "To understand the composition of a mineral deposit, geologists often study the parent rock from which it originated."
Remember, "parent rock" refers to the original rock from which another rock is formed, whether through weathering, erosion, or metamorphism.