Rock & Mineral Encyclopedia

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

Lemon Opal

A bright lemon-yellow opal, usually common opal, valued for its cheerful citrus color and translucent glow.

A vivid greenish-yellow quartz, usually heat-treated or irradiated, prized for its clean clarity and bright lemon color.

A bright lemon-to-canary yellow tourmaline colored by manganese, among the more cheerful and uncommon hues in the tourmaline family.

The yellow variety of beryl, also called heliodor or golden beryl, colored by iron and valued for its bright color and durability.

Bright yellow to golden tourmaline colored by manganese, with the most vivid canary stones among the rarest tourmaline hues.

A yellow to golden banded chalcedony colored by iron, ranging from natural honey tones to dyed commercial stones.

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

A trade name occasionally used for golden-yellow beryl (golden beryl or heliodor), the iron-colored yellow variety of the emerald mineral.

Limonite is an amorphous brown iron oxide ore, the rust-colored material behind ochre pigments and bog iron.

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

A yellow-brown alteration material formed when basaltic volcanic glass reacts with water, common in hydrovolcanic tuffs and pillow lavas.