The correct answer is option 4, Pitchblende. Pitchblende is a type of mineral that contains uranium, which is used as fuel in nuclear power stations.

Option 1, Bauxite, is incorrect. Bauxite is a type of ore that is used for the production of aluminum.

Option 2, Quartz, is incorrect. Quartz is a mineral made up of silicon and oxygen and is commonly used in the production of glass and ceramics.

Option 3, Feldspar, is incorrect. Feldspar is a group of minerals that are commonly used in the manufacture of glass, ceramics, and pottery.

Therefore, the correct option is 4, Pitchblende, as it is the mineral that is used as fuel in nuclear power stations.