Question

Why is luster important for mineral identification?

Answer 1

Luster is how the surface of a mineral reflects light. It is not the same thing as color, so it crucial to distinguish luster from color.Pearly luster is important in identifying the feldspars, which are the most common type of mineral.

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Answer 2

The luster of a mineral is the way that it reflects light. ... Minerals that are as brilliantly reflective as diamond have an adamantine luster. With a little practice, luster is as easily recognized as color and can be quite distinctive, particularly for minerals that occur in multiple colors like quartz.