The lustre of a mineral is its appearance in reflected light. It is metallic when the mineral shines like a metal, and non-metallic otherwise: vitreous (glassy, like quartz), pearly, resinous, and so on.
Earth and Space Sciences · Glossary
Earth and Space Sciences · Glossary
The lustre of a mineral is its appearance in reflected light. It is metallic when the mineral shines like a metal, and non-metallic otherwise: vitreous (glassy, like quartz), pearly, resinous, and so on.