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 transparent to milky opal that displays a soft bluish-white internal glow or sheen that seems to follow the light source.

The blue-green gem variety of microcline feldspar, often mottled with white, prized as an affordable ornamental stone.

A banded variety of chalcedony quartz, classically black or black-and-white, long favored for cameos and beads.

A pale green variety of feldspar moonstone showing a soft white or bluish adularescent sheen over a greenish body.

A hydrated silica gemstone famous for its shimmering play-of-color, ranging from white and black opal to fiery orange fire opal.

A pink, manganese-rich variety of zoisite used as an ornamental gemstone, often mottled with white quartz and grey matrix.

A banded chalcedony combining reddish-brown sard with white or black onyx layers, prized since antiquity for carved cameos.