Bell Work 9/15/2017-Get comp book!

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Presentation transcript:

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?

Identifying Minerals Comp Book page 12

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

Set up foldable… Color Luster Streak Breakage Density Hardness

COLOR Most minerals occur in more than one color. Worst property to identify a mineral by.

LUSTER Luster refers to how light is reflected from the surface of a mineral. Metallic (metal), Nonmetallic (glossy), No Luster (dull)

Breakage Fracture Cleavage Break irregularly Break along parallel, flat surfaces

Examples of cleavage:

Cleavage …cont. Sheet Blocky Prismatic Rhombohedral Cubic

Examples of Fracture:

Cleavage or Fracture? Cleavage

Cleavage or Fracture? Fracture

Cleavage or Fracture? Cleavage

Cleavage or Fracture? Cleavage

Cleavage or Fracture? Fracture

Cleavage or Fracture? Cleavage

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.