The correct answer is option 3: Quartz.

Semiconductors are materials that have electrical conductivity between that of conductors and insulators. They can be controlled to conduct or block electric current, making them key components in electronic devices.

Option 1: Silicon is a semiconductor. It is the most widely used material in the electronics industry due to its abundance and favorable electrical properties.

Option 2: Germanium is also a semiconductor. It was commonly used in the early days of solid-state electronics before silicon became more prevalent.

Option 3: Quartz, on the other hand, is not a semiconductor. It is an insulator, meaning it does not conduct electricity. Quartz is a crystalline form of silicon dioxide and is commonly used in watches and oscillators due to its piezoelectric properties.

Option 4: Gallium arsenide is another semiconductor. It is particularly useful for high-speed and high-frequency applications, such as in telecommunications and satellite systems.

In summary, while silicon, germanium, and gallium arsenide are all semiconductors, quartz is not and should be chosen as the correct answer.