#physics reflection
- Aventurine — A microcrystalline variety of quartz or feldspar, shiny and opaque, characterized by the presence of tiny inclusions of mica, hematite, or chlorite, which reflect light and produce a glittering effect called aventurescence; additionally, the term denotes a special artificial glass invented in Murano containing microscopic crystals of metallic copper. As an adjective, it describes a texture, a reddish-brown color, or an object presenting glittering metallic reflections similar to this mineral.