Rock & Mineral Encyclopedia

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

Bumblebee Jasper

A vivid yellow-and-black banded stone from Indonesian volcanic vents, colored by sulfur, arsenic minerals and iron oxides, not true jasper.

Obsidian colored brown by iron oxide inclusions, frequently banded or swirled with black as in mahogany obsidian.

A banded agate whose internal structures resemble cathedral spires, arches, or a city skyline of towers and pinnacles.

A banded agate that displays a moving shadow or flash across its surface when tilted under light, caused by closely spaced parallel bands.