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Bell Work 9/15/2017-Get comp book!
Which property describes the reflection of light off the surface of the mineral? A. Color C. Luster B. Density D. Hardness Which property is the LEAST reliable for mineral identification?
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Identifying Minerals Comp Book page 12
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Today’s Goals… Explain the breakage of minerals: fracture and cleavage
Determine the identity of a mineral based on its density, fracture, and/or cleavage
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Set up foldable… Color Luster Streak Breakage Density Hardness
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COLOR Most minerals occur in more than one color. Worst property to
identify a mineral by.
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LUSTER Luster refers to how light is reflected from the surface of a mineral. Metallic (metal), Nonmetallic (glossy), No Luster (dull)
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Breakage Fracture Cleavage Break irregularly
Break along parallel, flat surfaces
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Examples of cleavage:
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Cleavage …cont. Sheet Blocky Prismatic Rhombohedral Cubic
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Examples of Fracture:
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Cleavage or Fracture? Cleavage
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Cleavage or Fracture? Fracture
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Cleavage or Fracture? Cleavage
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Cleavage or Fracture? Cleavage
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Cleavage or Fracture? Fracture
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Cleavage or Fracture? Cleavage
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With a partner Observe different pictures and minerals of luster and breakage. Decide if the breakage is fracture or cleavage and nonmetallic or metallic. Write your responses on your answer sheet.
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