Which of the following minerals is likely to be absent in a region consisting mainly of igneous and metamorphic rocks?

Coal is likely to be absent in a region consisting mainly of igneous and metamorphic rocks. This is because coal is a sedimentary rock that forms from the accumulation of organic material in swampy environments over millions of years. Igneous rocks are formed from the solidification of molten rock, while metamorphic rocks are formed from the transformation of existing rocks due to heat and pressure. Neither of these processes involves the accumulation of organic material necessary for coal formation. Therefore, it is unlikely to find coal deposits in areas dominated by igneous and metamorphic rocks.