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Investigating Crystal Formation in Igneous Rocks with Salol Experiment

Explore the relationship between crystal size and Igneous rock types using Salol crystals. Observe crystallization at different temperatures to understand rock formation. Design experiments to study crystal growth factors.

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Investigating Crystal Formation in Igneous Rocks with Salol Experiment

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  1. Day 7 Explain why this is true: When a metamorphic rock is forming, it may be subjected to extremely high temperatures, yet it never completely melts. Because if it melts, it would become molten rock. If it then cools and hardens, it would be an igneous rock. Daily Warm-Up Exercises

  2. Labels Exercise 8.4

  3. Naming Labels

  4. Naming Labels and Explanatory Labels

  5. Captions Exercise 8.5

  6. CaSE Book Student Rescource Book, Page 23

  7. Without a caption, it is difficult to know much about this image:

  8. With the caption in place, the viewer has the necessary information. As magma cools, different minerals come together toform crystals, as in this granite. The crystals growtogether, filling the spaces.

  9. Salol Crystals (Part 2, steps 1-10) Investigation 8 One Rock to Another

  10. Examine your igneous rocks with a hand lens. Look for crystals (pieces of pure minerals) in the rocks. Intrusive & Extrusive Rocks

  11. Is there a relationship between crystal size and whether the igneous rock was intrusive or extrusive? Intrusive & Extrusive Rocks • Intrusive rocks like granite have larger crystals. • Obsidian doesn’t appear to have any crystals. Why do some igneous rocks have larger crystals than others?

  12. Rocks must reach 750 0C (1382 0F) or more before they will begin to melt. We can’t melt rocks in class, but we will use Salol to simulate the melting and cooling of a rock. Salol melts at the temperature of hot tap water. Salol

  13. Open to a new page in your journal. Title your page: Salol Observations Observe Salol Melting

  14. Each group needs: journal to record observations two bottles of Salol hot and cold water THE BOTTLES MUST STAY CLOSED Materials for Salol Lab

  15. What did the salol look like before you placed it in hot water? white crystals on the side of the bottle How long did it take for the salol to melt? about 1 minute Discuss What Happened

  16. What happened when you placed the salol in the cold water? it hardened and turned back into crystals What do the crystals look like? some look like crushed ice or big sugar crystals; others look like flat needles or feathery branches; some grow in rosettes from a central point or circle Discuss What Happened

  17. Forming crystals is called crystallization. Crystal shape is one of the properties geologists use to help them identify minerals. Salol crystals form the same shapes each time they crystallize (needles; feathers; diamonds; broken ice). Crystallization

  18. How can we find out the temperature at which salol melts? Salol melts at around 40 0C. If the temperature drops below 40 0C, the salol will begin to crystallize. Melting Temperature put the bottle in different temperatures of water and find the lowest temperature at which it will melt

  19. Crystal Size Investigation Design an experiment using salol to answer the following questions: • Why do some igneous rocks have larger crystals than others? • What are some variables that might affect the size of the crystals that form?

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