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The Scheme for Igneous Rock Identification

The Scheme for Igneous Rock Identification. A Brief Tour. Grain size. Crystal size. Description. Igneous rocks have “Intergrown Crystals”. Intergrown. Intergrown. Intergrown. Not Intergrown. Outside the volcano: Extrusive. Inside the Earth: Intrusive. Where it was formed. Bubbles?.

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The Scheme for Igneous Rock Identification

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  1. The Scheme for Igneous Rock Identification

  2. A Brief Tour

  3. Grain size Crystal size Description

  4. Igneous rocks have “Intergrown Crystals”

  5. Intergrown

  6. Intergrown

  7. Intergrown

  8. Not Intergrown

  9. Outside the volcano: Extrusive Inside the Earth: Intrusive Where it was formed

  10. Bubbles? Yes= Vesicular

  11. No=Non-vesicular Bubbles?

  12. Neither Light nor Dark Very Light Color NotVery Light Very Dark Not Very Dark Light Dark Darkest Lightest

  13. Very Light Medium Density Density Light Dense Very Dense

  14. Finding The Minerals Unless you have other information, work in the middle of the rock’s box. Identify the rock.

  15. This is the amount of Potassium Feldspar in the rock.

  16. This is the amount of Quartz in the rock.

  17. This is the amount of Plagioclase Feldspar in the rock.

  18. Use tick marks on a scrap paper to measure the percentage. Potassium Feldspar 25% Quartz 40%

  19. Name a light-colored, glassy rock with no bubbles. Practice

  20. Name a coarse-grained, dense rock.

  21. Name a dark colored , dense rock that can be intrusive or extrusive

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