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(How can we identify which mineral is which?)
8 Ways to Identify Minerals
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1. Color
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2. Luster the way the mineral’s surface reflects light.
metallic, earthy, waxy, greasy, glassy
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Luster Resinous luster
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Discuss… How is luster different from color?
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3. Streak-- the color of the powder
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Streak – the color of the powder
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-Cleavage 4. The way the mineral breaks
-breakage occurs along smooth,flat surfaces
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Examples of Cleavage
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-Fracture Breakage occurs in curved or irregular shapes
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5. Hardness resistance to scratching Mohs Hardness Scale 1-10
Talc-- 1 (SOFTEST) Diamond 10 (Hardest)
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6. Density Minerals have different densities
How much MASS something has in relation to its size Pyrite= 5.01g/cm3
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7. Crystal Systems Minerals can form different shaped crystals with varying numbers of sides.
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8. Special Properties Some properties only apply to a few types of minerals Fluorescence Magnetism Chemical Reactions Taste Optical Properties Radioactivity
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example of optical properties
Calcite Quartz
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