Rock & Mineral Encyclopedia

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

Galena

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

A brassy copper-iron sulfide that is the world's most important copper ore, often showing colorful iridescent tarnish.

A black metallic silver antimony sulfide, historically a notable silver ore known as brittle silver ore.

An Oregon picture jasper from the Rogue River area showing earthy scenic patterns in tan, brown, gold, and cream.

A celebrated plume agate from the Oregon-Idaho border, known for dramatic black, gold, and red plumes in clear chalcedony.

Rutile is a major titanium ore and the famous golden needle inclusion that gives rutilated quartz its shimmering threads.