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