Rock & Mineral Encyclopedia

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

Tibetan Quartz

Clear quartz mined in the Himalayan region, often double-terminated and containing dark hematite or carbon inclusions.

Clear or smoky quartz threaded with golden to reddish needles of rutile, also poetically called Venus hair stone.

A man-made opalescent glass that glows milky blue in reflected light and warm orange when backlit, often sold as a crystal.

A prized plume agate with rose-pink and red feathery inclusions suspended in clear chalcedony, from the western U.S.

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