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In mineralogy, the appearance of a mineral surface in terms of its light-reflecting qualities. Lustre depends on a mineral's refractivity (seerefraction), transparency, and structure. Variations in these properties produce different kinds of lustre, from metallic (e.g., gold) to dull (e.g., chalk).
This entry comes from Encyclopædia Britannica Concise. For the full entry on lustre, visit Britannica.com.