chalcocite (noun)

1. In the anime series, the main character discovers a hidden chalcocite mine that holds a mysterious power.

2. In the science fiction novel, scientists use chalcocite to power advanced technology in a post-apocalyptic world.

3. The protagonist in the literature piece embarks on a dangerous journey to find the legendary chalcocite, which holds the key to defeating evil.

4. During the California Gold Rush in the 1840s, miners uncovered a rich vein of chalcocite, leading to a significant increase in copper production.