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Today’s Objective: What makes Igneous Rocks special? Do Now: THINK

Delve into the world of igneous rocks to understand their unique properties, textures, and formation processes. Learn about intrusive and extrusive igneous rocks, their textures including coarse-grained and glassy, and their mineral compositions. Explore the differences between mafic and felsic rocks, and examine specific examples like Rhyolite and Gabbro. Enhance your knowledge of Earth science by contrasting Basalt and Granite in terms of formation, texture, color, and composition.

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Today’s Objective: What makes Igneous Rocks special? Do Now: THINK

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  1. Today’s Objective: What makes Igneous Rocks special? Do Now: THINK What are sedimentary and how are they classified?

  2. Environments of Formation ESRT pg 6

  3. Granite Environments of Formation – rocks that form when magma hardens beneath Earth’s surface. Intrusive Igneous Rock ** The slower MAGMA cools the larger the crystals ***

  4. Extrusive Igneous Rock – When lava hardens on the Earth’s surface. • Lava cools quickly, resulting in - Smaller crystals. - Vesicular texture (holes). - No Crystals at all (glassy).

  5. Textures of Igneous Rocks

  6. Textures of Igneous Rocks Coarse Grained – Slow cooling results in the formation of large crystals. – Rapid cooling of magma or lava results in rocks with small, interconnected mineral grains. Intrusive Fine Grained Extrusive

  7. Glassy Texture Ex: Obsidian – Glassy texture results from cooling that is so fast that minerals do not have a chance to crystallize. Extrusive Vesicular Texture - Vesicles (holes, pores, or cavities) are the result of gas bubbles, which often occurs during volcanic eruptions. Ex: Pumice

  8. Characteristics of Igneous Rocks

  9. – a lighter color • a lower density • - rich in Silicon (Si) and Aluminum (Al) • – a darker color • a higher density • - rich in Iron (Fe) and Magnesium (Mg) Mafic Felsic Composition of Igneous Rocks

  10. Mineral Composition of Igneous Rocks Rhyolite is made up of: - Potassium feldspar - Quartz - Plagioclase feldspar - Biotite (mica) - Amphibole

  11. Mineral Composition of Igneous Rocks What is Gabbro made of? - Plagioclase feldspar - Biotite (mica) • Pyroxene • Olivine • Amphibole

  12. Using your knowledge of earth science, your earth science reference tables and your class notes contrast Basalt and Granite in terms of how each forms, the texture of each, the color and the composition in your notebook.

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