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Webmineral.com: Mineral Luster
This site lists thirty different terms for describing the luster of minerals.
Amethyst Galleries
Amethyst Galleries: Mineral Galleriy: What Is Luster?
Mineral Galleries provides not only a definition of luster, but also a list of common terms used to describe this mineral property.
Amethyst Galleries
Amethyst Galleries: Mineral Gallery: What Is Streak?
Streak is the color of the powder of a mineral. This page discusses the importance of streak when identifying minerals.