Rock & Mineral Encyclopedia

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

Green Marble

A green ornamental stone, often serpentine-rich marble or verde antique, valued for its rich green color and white veining.

A high-grade metamorphic rock defined by alternating light and dark mineral bands, formed under intense heat and pressure.

Agate that forms in flat cracks or veins of host rock rather than rounded nodules, producing straight, parallel banding.