Luster
The appearance and character the surface of a mineral based on light that is reflected from that surface. Determining luster involves considering the brilliance of the surface, and estimating its ability to reflect light. Metals are said to have a metalic luster; silk, a silky luster; pearls, a pearly luster.
Citation
"Luster", Ohio History Central, July 1, 2005, http://www.ohiohistorycentral.org/entry.php?rec=1205
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