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1-2 Identifying Minerals

1-2 Identifying Minerals. Classify Minerals using common mineral identification techniques. Explain special properties of minerals. Color. Color is not the best factor to use in identifying a mineral. Impurities and weathering cause minerals to come in different colors.

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1-2 Identifying Minerals

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  1. 1-2 Identifying Minerals Classify Minerals using common mineral identification techniques. Explain special properties of minerals.

  2. Color • Color is not the best factor to use in identifying a mineral. • Impurities and weathering cause minerals to come in different colors.

  3. Luster – The way lights reflects off a mineral’s surface. • Metallic – shiny like metal • Sub-metallic – shiny but not smooth looking. • Non-metallic – vitreous, silky, resinous, waxy, pearly, and earthy.

  4. Streak – the color of a mineral in powdered form. • Rub a mineral against an unglazed porcelain tile (streak plate) • Streak color is a more reliable way to use color in identifying a mineral in some cases.

  5. Cleavage Vs Fracture • Cleavage is the tendency for some minerals to break along flat surfaces. • Fracture is the tendency for some minerals to break unevenly along curved or irregular surfaces.

  6. Hardness – a mineral’s resistance to being scratched. • Use Moh’s hardness scale where 1 is softest and 10 is hardest.

  7. Density – The measure of how much matter there is in a given amount of space. • D = m/v • Water is 1g/cm3 • Specific gravity – the ratio of a mineral’s density to water’s • Gold is 19

  8. Fluorescence – minerals glow under a black light. Chemical Reaction – reacts with acid Optical properties – when looking through a mineral the appearance changes Taste – mineral has a distinctive taste. Magnetism – mineral will attract iron objects. Radioactivity – minerals that contain uranium or radium can be detected with a Geiger counter Special Properties

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