Clyde Minaret is named after Norman Clyde, the High Sierras' most prolific first ascensionist. It is a very fine peak made from, not granite, but a more ancient metamorphic rock, which gives it its characteristic, almost non-Sierra-like shape of a sharp needle (as seen from the ski slopes of Mammoth). Its dark triangular SE face is home to a great classic rock climb. Agnew Meadows is the trailhead. Get there either by shuttle bus from Mammoth during the day, or arrive by a car late at night.
https://www.mountainproject.com/area/105809043/clyde-minaret