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Identifying Minerals Key Concept: Each mineral has characteristic properties that can be used to identify it. • Color • Streak- the color of a minerals powder • Luster- how a mineral reflects light (shiny, metallic, dull, waxy, greasy) • Density- mass divided by volume • Hardness- measured by Moh’s Hardness Scale • Cleavage or Fracture- how a mineral breaks • Crystal structure