beryllium (noun)

1. In Greek mythology, beryllium was believed to possess magical powers and was associated with the god Apollo.

2. During the Renaissance period, beryllium gained popularity in jewelry-making and was highly valued by the European aristocracy.

3. In the classic novel 'The Count of Monte Cristo', the protagonist discovers a hidden treasure containing precious beryllium gemstones.

4. The sci-fi movie 'Avatar' featured a fictional mineral called 'unobtainium' which shared some properties with beryllium.