What is LUSTRE?

The degree of sheen of a mineral; depends upon the quality and amount of light that is reflected from its surface. The highest degree of lustre in opaque minerals is splendent, the comparable term for transparent minerals being adamantine ie the lustre of diamond. Metallic and vitreous indicate less brilliant lustre, while silky, pearly, resinous, and dull are self-explanatory terms covering other degrees of lustre,

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