Rock & Mineral Encyclopedia

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

Chrysocolla

A vivid blue-green hydrated copper silicate, soft on its own but prized as a gem when hardened by intergrown quartz or chalcedony.

An opaque blue variety of chalcedony jasper, less common than red or green forms, colored by mineral inclusions.

A rare, intensely blue chalcedony colored by copper-rich chrysocolla, prized as the most valuable of the blue chalcedonies.

A rare deep-blue copper silicate mineral, often fibrous or massive, named for the Shattuck Mine in Arizona and prized by collectors.

A vivid copper-bearing Mexican stone of red cuprite and green chrysocolla that evokes a desert sunset.

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

A translucent quartz speckled with glittery mineral inclusions that produce a shimmering aventurescence, most often green.

Quartz colored blue by inclusions of the mineral dumortierite, giving a denim-like blue ornamental stone harder than dumortierite alone.