The two most abundant, end-product minerals formed by the complete chemical weathering of a granitic rock would mostly consist of and plagioclase and orthoclase quartz and olivine iron oxide and calcite feldpar and micas. clay and quartz

Clay and quartz

Explanation:Granite is a type of igneous rock that is present for injecting magma into the crust of Earth and then cools down. When weathering process occurs then there is breakage in the rocks at the Earth’s surface into other substances such as sediments, etc.

So, when there is the weathering in the granite the quartz will be same residual minerals because they have a resistance to weathering and biotite  will have a hydrolysis process for the formation of clay.