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Igneous Rocks

Igneous Rocks. How are Igneous Rocks Formed?. Formed from cooled magma & lava. How Igneous Rocks are Formed. Mineral content = high concentration of silica = light color Origin Intrusive – magma – large crystals – granite Extrusive – lava – small crystals - basalt. Intrusive/Extrusive.

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Igneous Rocks

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  1. Igneous Rocks

  2. How are Igneous Rocks Formed? Formed from cooled magma & lava

  3. How Igneous Rocks are Formed • Mineral content = high concentration of silica = light color • Origin • Intrusive – magma – large crystals – granite • Extrusive – lava – small crystals - basalt

  4. Intrusive/Extrusive

  5. How Igneous Rocks are Formed • Texture • Coarse or fine grained • Glassy What texture is this?

  6. Classifications • Texture • Coarse or fine grained • Glassy What texture is this?

  7. Classifications • Texture • Coarse or fine grained • Glassy What texture is this?

  8. Question • People at “C” seats – Close your notebooks and describe to your table how Igneous rocks are formed.

  9. Rock Box Classifications • Phaneritic • All grains equal in size • Porphyritic • 2 distinct grain sizes • Aphantic • Microcrystalline – grains to small to see • Glassy • Glass-like material

  10. Rock Box Classifications • Phaneritic • All grains equal in size

  11. Rock Box Classifications • Porphyritic • 2 distinct grain sizes

  12. Rock Box Classifications • Glassy • Glass-like material

  13. Rock Box Classifications • Aphantic • Microcrystalline – grains to small to see

  14. Question • Discuss with your shoulder partner how an intrusive igneous rock is formed.

  15. Question • Discuss with your shoulder partner how an intrusive igneous rock is formed. • An intrusive igneous rock is formed when magma hardens below the Earth’s surface.

  16. Igneous Rock ID Hints • Large crystals • Holes in the rock • Glassy (black glass)

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