Rock & Mineral Encyclopedia

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

Fluorite

A soft, colorful calcium fluoride mineral famous for cubic crystals, perfect octahedral cleavage, and fluorescence under UV light.

A purple-hued common opal, much of it the Mexican "morado" type, valued for even violet color rather than play-of-color.

The purple variety of quartz, colored by iron and natural irradiation, prized as the classic violet birthstone of February.

A natural bicolor quartz that combines purple amethyst and golden citrine in a single crystal.

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

A natural bicolor quartz blending amethyst purple with prasiolite green in a single crystal, prized as a metaphysical heart-crown stone.

The pure colorless variety of beryl, valued as crystal specimens and as a brilliant alternative to clearer gemstones.

Transparent, colorless beryl (goshenite), the pure form of the species valued for its clarity, hardness, and well-formed crystals.