- a kind of glass flecked with spangles, as from copper filings or bits of chromic oxide
- a translucent mineral containing reflective particles; specif., a variety of chert that contains sparkling bits of mica, hematite, etc.
Origin of aventurineFrench ; from Italian (vetro) avventurino, aventurine (glass): so named from resembling the mineral avventurina (; from avventura, chance), so named from its rarity: see adventure
- An opaque or semitranslucent brown glass flecked with small metallic particles, often of copper or chromic oxide.
- Any of several varieties of quartz or feldspar flecked with particles of mica, hematite, or other materials. Also called sunstone.
Origin of aventurineFrench, from aventure, accident (so called because of its accidental discovery or the randomness of inclusions in it); see adventure.