1. Corundum (Sapphire/Ruby): While technically an oxide mineral, corundum is incredibly hard (9 on the Mohs Hardness Scale) and has a metallic luster in some varieties. It's the main component of sapphires and rubies.
2. Quartz: Quartz is a silicate mineral, but some varieties like amethyst and smoky quartz have a slightly metallic luster. It's also very hard (7 on the Mohs scale).
3. Pyrite (Fool's Gold): This sulfide mineral is known for its metallic golden color. It's harder than glass (6.0-6.5 on the Mohs scale).
Important Note: While these minerals are harder than glass, their ability to scratch it depends on factors like the specific crystal face, the force applied, and the presence of impurities.
