Lustrous mineral is a term used to describe minerals that have a shiny, reflective surface. The two most common examples of lustrous minerals are SPAR and BERYL. SPAR is a type of mineral that is usually colorless or white and has a glassy or pearly luster. BERYL is a mineral composed of beryllium aluminum cyclosilicate and is known for its beautiful blue, green, and yellow colors. Both SPAR and BERYL are popular in jewelry and other decorative items due to their attractive appearance.