Question

Explain the property of appearance of substance​

Answer 1

Answer:

Luster is a property that describes how light is reflected on the surface of a mineral. It is one of the properties mineralogists look at when trying to determine the identity of a mineral.

Minerals may be categorized according to whether they are opaque or transparent. A thin section of an opaque mineral such as a metal will not transmit light, whereas a thin section of a transparent mineral will. The absorption index of an opaque mineral is high. Light which is incident upon an opaque mineral such as a metal is unable to propagate through the mineral due to this high rate of absorption, and will thus be reflected. Opaque minerals typically reflect between 20% to 50% or more of the light incident upon them. In contrast, most of the light which is incident upon a transparent mineral passes into and through the mineral; transparent minerals may reflect as little as 5% of the incident light and as much as 20%. Typically those minerals which possess metallic bonding are opaque whereas those where ionic bonding is prevalent are transparent.

     Relative differences in opacity and transparency are described as luster.

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