Mohs hardness scale - A scale that rates a mineral on how easy it is to scratch it.  , Streak - Color of the powder left on a streak plate when the mineral is scraped across it., Luster - How light is reflected from the surface of a mineral., Cleavage - Mineral breaks into flat surfaces. , Fracture - Mineral breaks into rough, jagged surfaces. , The 5 characteristics of minerals - Natural, inorganic, solid, chemical composition, and crystalline structure. ,

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