Which rock would produce a more fertile soil those derived from igneous or metamorphic?

Igneous rocks typically produce more fertile soil than metamorphic rocks. This is because igneous rocks, especially those rich in minerals like feldspar and quartz, weather more readily to form nutrient-rich soils. Metamorphic rocks, on the other hand, often have a more complex mineral composition and can be denser, leading to slower weathering rates and less nutrient availability. Thus, soils derived from igneous rocks generally have better fertility potential.