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Mineralogy

Mineralogy. Rock : mixture of minerals Mineral: naturally occurring; definite chemical composition Mineralogy: the study and classification of minerals. Properties. Cleavage: the way some minerals break along certain lines of weakness in their structure. -. Click for animation.

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Mineralogy

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  1. Mineralogy • Rock: mixture of minerals • Mineral: naturally occurring; definite chemical composition • Mineralogy: the study and classification of minerals

  2. Properties Cleavage: the way some minerals break along certain lines of weakness in their structure • - • Click for animation

  3. Properties Fracture describe the shape and texture of the surface formed when a mineral is fractured • - • Click for animation

  4. Properties Hardness:measures how well a substance resists scratching fingernail = 2.5 copper coin = 4.5 iron nail = 5.5 glass = 6 • -

  5. Properties Streakcolour of powdered mineral observed on a streak plate (or tile) *restriction: mineral must have a hardness of <7 (tile hardness is 7) to leave a mark • - • Click for animation

  6. Properties Lustre: appearance/reflection of light from the surface Vitreous (glassy) Metallic Pearly/silky • -

  7. Properties Density mass per unit volume (g/mL); depends on the elements that make up the mineral • -

  8. Identification Magnetism: deflecting a compass needle due to the presence of iron Crystal Shape: tendency of minerals to develop certain shapes • -

  9. Prismatic • Diamond • Calcite • Feldspar

  10. Silicon Dioxide: Sand & Quartz Prismatic

  11. Tabular • Like a table top • Mica • gypsum

  12. Massive • No crystals

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