Identifying Minerals Chapter 3.

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Presentation transcript:

Identifying Minerals Chapter 3

Color Visual Property Perceptual, what you see Not very reliable

Color Continued Calcite Halite

Streak Color of a mineral in powdered form

Luster Way the surface of a mineral reflects light Identified as metallic or nonmetallic

Breakage Pattern Cleavage Fracture The tendency of a mineral to break along a flat surface or to break unevenly along a curved or irregular surface. Cleavage Fracture

Hardness The resistance of a mineral being scratched Mohs scale: 1 – 10

How to test Hardness Determined by a scratch test A mineral can scratch a mineral softer than itself A mineral cannot scratch a mineral harder than itself Example: Topaz can scratch Quartz, but quartz can’t scratch Topaz

Density Amount of matter in a given space Mass per unit volume

Unusual properties Chemical reaction Taste Fluorescence Magnetism Radioactive

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