you and a friend are hiking through Enchanted Rock State Park and you happen to discover an entire outcrop (i. e. exposure) of crystalline rock with large potassium feldspar, plagioclase and quartz crystals. Also present is some dark colored biotite and hornblende. None of the minerals seem to show any preferred orientation. What type of rock (igneous, metamorphic, or sedimentary) have you found

igneous rock

Explanation:

The above description in the question reflects an igneous rock. Igneous rock is a rock that's formed when magma solidifies after cooling.

Since we are told that the minerals doesn't seem to show any preferred orientation and that some dark colored biotite and hornblende are present, thus shows that it's an igneous rock as the other features are that of sedimentary and metamorphic rock.