Luster is: "The reflection of light from the surface of a mineral, described by its quality and intensity; the appearance of a mineral in reflected light."
Common descriptive words would be glassy, dull, earthy, waxy, vitreous, metallic, etc...
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Luster
Opal typically exhibits a vitreous to pearly luster. This unique luster contributes to its vibrant play-of-color, making opals highly sought after in jewelry. The luster can vary depending on the type of opal and its specific characteristics.
The nonmetallic physical characteristic of gypsum is its pearly or silky luster when it is broken into thin sheets or cleaved. This quality gives gypsum a unique appearance compared to metallic substances.
cleavage, luster, color, streak
A stainless steel black luster soldier is known for its durability, resistance to corrosion, and sleek black appearance.
luster. Luster refers to how light is reflected off the surface of a mineral or rock, which can help in identifying its characteristics and composition.
Luster and composition are two characteristics used to classify minerals.
Polished and shiny metals have several characteristics. They are typically malleable, and are also ductile. Their shininess is actually called their luster.
Through testing of a sample to determine hardness, luster, streak, density, and chemical composition.
You can use the characteristics(color, luster, streak, hardness, cleavage, fracture, and crystal).