The highest level of lustre, seen in minerals with high refractive index (e.g., Diamond).
Non-reflective, matte appearance.
Appearance of being covered in a thin film of oil.
Opaque and highly reflective appearance of metals.
Soft, iridescent sheen seen in minerals with perfect cleavage.
Medium-refractive-index lustre resembling resin.
Fine, parallel fibrous reflection.
Intermediate between metallic and non-metallic (e.g., Hematite).
The most common lustre, resembling broken glass (e.g., Quartz).
Soft, low-reflectivity appearance of wax or candles.
The interaction of light with the surface of a mineral, describing its appearance.