Answer
Based on its location in the Sierra Nevada batholith, Mount Whitney is likely composed mainly of granitic rocks. The Sierra Nevada batholith is predominantly composed of granitic intrusions, which are formed from the crystallization of magma deep within the Earth's crust. Granitic rocks are known for their light color and coarse-grained texture, and they are commonly associated with batholiths. Therefore, it is reasonable to expect that Mount Whitney, located within the Sierra Nevada batholith, consists primarily of granitic rocks.
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