Rock & Mineral Encyclopedia

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

Mexican Lace Agate

A vividly swirling banded agate from northern Mexico with intricate looping patterns in warm reds, golds and creams.

A swirling, intricately banded lace agate from Eswatini (Swaziland) in soft greys, blues and lavenders with delicate folded patterns.

A translucent, soft blue variety of microcrystalline quartz whose color comes from light scattering through its fine structure.

A nodular rhyolite geode-like ball whose plain exterior hides a star-shaped agate or chalcedony core when cut.