Notebook and eraser do not have any lustre because they are not metals. Lustre is gentle shining light that is reflected from a surface, for example from polished metal. Lustre is an optical property of minerals. There are two main types of lustre, metallic and non-metallic, with an intermediate lustre of submetallic.
- The intensity of the lustre depends upon the amount of light reflected from the surface, which is generally related to the refractive index of the mineral.
- Non-metallic, or sub-metallic luster includes waxy, pearly, silky, vitreous, greasy, resinous, dull, and adamantine.