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The Scheme for Igneous Rock Identification

The Scheme for Igneous Rock Identification. A Brief Tour. Grain Size. Crystal size. Description. Intergrown Crystals. Intergrown. Intergrown. Not Intergrown. Outside the volcano: Extrusive. Where it was formed. Bubbles?. Yes= Vesicular. Bubbles?. No=Non-vesicular.

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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. Intergrown Crystals

  5. Intergrown

  6. Intergrown

  7. Not Intergrown

  8. Outside the volcano: Extrusive Where it was formed

  9. Bubbles? Yes= Vesicular

  10. Bubbles? No=Non-vesicular

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

  12. Density Medium Density Very Light Light Dense Very Dense

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

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

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

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

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

  18. Name a light-colored, fine-grained rock with no bubbles. Practice

  19. Name a coarse-grained, dense rock.

  20. Name a very light-colored, glassy, extrusive rock with bubbles.

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