Lesson 24 What can we get from the rocks

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Lesson - 24 What can we get from the rocks ?

• What are the differences among rock, stone and
  mineral ?
• How many common rock types are there ?
• Could you give some examples of rocks of each
  rock type?
• Could you give some example of minerals ?
• Could you give some examples of ores ?
• How are metals (minerals), in general, be
  obtained (extracted) from ores ?

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What are the differences among rock, stone and
mineral ?

• Rock a solid mass of mineral or a mixture of
  minerals forming the earth crust (usually a
  mixture).
• Stone a small piece of rock (usually a
  mixture).
• Mineral a naturally occurring solid with a
  definite crystalline structure and chemical
  composition (i.e. an element or a compound)

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How many common rock types are there ?

• Sedimentary rocks formed by sedimentation of
  minerals, remains of plant and animal or other
  precipitate.
• Igneous rocks formed from cooling of molten
  rock.
• Metamorphic rocks formed from sedimentary or
  igneous rock under heat and / or pressure.

4
Could you give some examples of rocks of each
rock type?

• Sedimentary rocks
• limestone, chalk, sandstone
• Igneous rocks
• granite, basalt
• Metamorphic rocks
• marble, slate

5
Could you give some example of minerals ?

• Quartz silicon(IV) oxide, SiO2(s)
• Rock salt sodium chloride, NaCl(s)
• Graphite Carbon, C(graphite)
• Diamond Carbon, C(diamond)
• Gold Au(s)
• Calcite Calcium carbonate, CaCO3(s)

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Could you give some examples of ores ?

• Ore rock / earth from which metal / mineral can
  be profitably extracted.
• Bauxite mostly aluminium oxide, Al2O3(s)
• Copper pyrite mostly copper iron sulphide,
  CuFeS2(s)
• Haematite mostly iron(III) oxide, Fe2O3(s)
• Galena mostly lead(II) sulphide, PbS(s)

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How are metals (minerals), in general, be
obtained (extracted) from ores ?

• Mining (digging up the ore) ? Concentration
  (removing waste rock) ?Extraction (Removal of
  other mineral) ?Purification (Removal of
  remaining impurities)

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Classwork

• pg103 Q1,2,21,22