Nonmetals generally do not have luster. Luster refers to the way light interacts with the surface of a material, and it is typically associated with metals, which have a shiny appearance. Nonmetals, on the other hand, are usually dull and do not reflect light in the same way.
For example, materials like sulfur and phosphorus are nonmetals and appear dull. They lack the reflective properties that give metals their characteristic shine. However, there are some exceptions. For instance, iodine, which is a nonmetal, has a slight metallic luster in its crystalline form.
In summary, while most nonmetals do not have luster, there can be exceptions depending on the specific nonmetal and its form.