Rock & Mineral Encyclopedia

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

Moss Opal

A common opal containing moss- or fern-like mineral inclusions that resemble plants suspended in a pale silica body.

A finely speckled pale jasper trade stone named for its sesame-seed-like flecks, closely related to Kiwi Jasper.

A pale jasper threaded with black, fern-like mineral dendrites that mimic plants, trees, and frost despite being inorganic.

A soft sky-blue banded chalcedony prized for its delicate, lace-like white and blue swirling patterns.

A brecciated, chatoyant quartz with swirling blue, gold, and brown fibers that shimmer like a stormy sky.

A feldspar gem famous for adularescence, a floating blue-white glow that shimmers across the stone like moonlight.

A sought-after elbaite tourmaline in teal hues that blend blue and green, prized for its ocean-like color.

A copper-iron sulfide ore famous for its iridescent peacock-like purple and blue tarnish; often sold as treated chalcopyrite.

A precious opal showing dominant peacock-like blue, green and teal play-of-color, often on Ethiopian material.

The blue-grey relative of tiger's eye, a chatoyant quartz showing a shifting band of light like a bird of prey's eye.