Rock & Mineral Encyclopedia

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

Chrome Diopside

A vivid green chromium-bearing diopside, an affordable emerald-like gem mined largely in Siberia.

An intensely green tourmaline colored by chromium and vanadium, prized for its vivid emerald-like color from East Africa.

A rare breccia formed by meteorite impact, containing shocked rock fragments and glassy melt blobs welded together.

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

A quartz crystal containing pink to lilac lithium-bearing mineral inclusions that give a soft cloudy lavender or rose coloration.