Despite the name, Feldspar station is not located on Feldspar Street; it is actually located on Union Drive West between Frankfort Avenue, Emerald Street and Castle Drive, at the borders of City Hall, Suffolk, and Castle Garden City. Two of the station's three entrances are located on the eastern side of Union Drive West, while one is located on the western side. The station may have been named such to avoid confusion with the Emerald and Frankfort Avenue stations (though it is unknown why the stop would not have simply been called Emerald West, Frankfort Avenue South, or some such other name to distinguish it from the other two stations).
Feldspar is in close proximity to Castle Garden City's piers, from which the player can acquire a boat, either to reach Happiness Island and the Statue of Happiness, or for other purposes. A street vendor is also based on the northeastern entrance to the station. The station is unremarkable otherwise, sharing the same entrance and platform design as all other subway stations in the game.