Rock & Mineral Encyclopedia

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

Citrine

The golden-yellow variety of quartz, ranging from pale lemon to deep madeira amber, often produced by heating amethyst.

A cheerful yellow opal ranging from translucent common opal to golden fire opal, colored by trace iron in the silica.

A warm golden to amber translucent chalcedony agate whose color and glow resemble honey, sometimes with banding.

A lead molybdate mineral famous for thin, brilliant orange to yellow tabular crystals, prized by collectors and an ore of molybdenum.

A warm golden-to-amber variety of calcite, a soft calcium carbonate mineral valued for its honeyed glow and easy carving.

A warm golden-to-amber opal ranging from translucent common opal to precious stones that flash play-of-color over a honey body.

A golden-toned opal ranging from translucent common opal to precious stones flashing color against a warm yellow body.

A translucent to transparent opal in warm yellow, orange, and red tones, prized for body color rather than play-of-color.

A striking lead chromate mineral prized for its brilliant orange-red prismatic crystals, with the finest specimens from Tasmania.