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 Aventurine

A green quartz speckled with shimmering fuchsite mica that produces a glittering aventurescence, popular as an affordable ornamental stone.

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

An opaque green variety of chalcedony quartz colored by iron and chlorite-group inclusions, prized as a durable carving and cabochon stone.

A common opal colored green by nickel or chromium impurities, usually opaque and cut into cabochons and beads.

Green tourmaline cut as a cabochon to show a sharp moving band of light (chatoyancy) caused by fine parallel inclusions.

A man-made glittering glass packed with tiny copper crystals, traditionally reddish-brown but also made in blue and green.

A translucent common opal from the Andes prized for its serene blue to blue-green color, usually cut into cabochons and beads.