Rock & Mineral Encyclopedia

Search and identify 1,000+ rocks, minerals, crystals, and gemstones — with properties, formation, colors, hardness, and how to tell them apart.

Peacock Ore

A copper-iron sulfide ore famous for its iridescent peacock-like purple and blue tarnish; often sold as treated chalcopyrite.

Natural emerald crystals still embedded in their host rock, prized as mineral specimens that show how the gem grew in place.

A heavy, lead-grey metallic mineral with perfect cubic cleavage, galena is the world's main ore of lead and often carries silver.

A silver sulfide that is one of the most important silver ore minerals, forming dark metallic crystals and wires.

A bronze-colored iron sulfide notable for being the most magnetic of the common sulfide minerals and an important nickel host.