Star Trek: Stargazer
Hargatite is a commonly occurring metal in the Harga system. Hargatite is used in high-energy connectors, such as dilithium crystal clips, phaser power couplings, etc.
Hargatite is mined throughout the Harga system. The current theory is that a roving quasar crashed into the star, releasing a large amount of energy that allowed for the unique hargatite matrix to form. Hargatite is found in other parts of the galaxy, but not in the vast amounts and purity found in the Harga system.