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Classifying Rocks

Classifying Rocks. CH 3 Prentice Hall p. 74-77. Rocks. Are made of mixtures of minerals and other materials, although some may contain only a single mineral. Granite Quartz Feldspar, Mica Hornblend. Characteristics (brainstorm). Texture. Size, shape and pattern of rock grains.

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Classifying Rocks

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  1. Classifying Rocks CH 3 Prentice Hall p. 74-77

  2. Rocks • Are made of mixtures of minerals and other materials, although some may contain only a single mineral. • Granite • Quartz • Feldspar, • Mica • Hornblend

  3. Characteristics (brainstorm)

  4. Texture • Size, shape and pattern of rock grains. • Grains- particles of minerals or other rocks.

  5. Texture (Grain Size) • Course Grained- Large and easy to see. • Fine Grained- small.

  6. Texture (Grain Shape) • Grains vary widely. • Tiny particles of sand. • Look like seeds • Crystals • Smooth / rounded • Jagged

  7. Texture (Grain Pattern) • Grains often form patterns. • Some lie in flat layers. • Rows of grains. • Random grains.

  8. Texture (No Visible Grain) • Have no grain. • They cool very quickly when they form, gives the rock a smooth, shiny texture like thick glass. (obsidian) • Or made out of extremely small particles of silica that settle out of water. (flint)

  9. Origin • 3 Groups- refers to how the rocks formed.

  10. Mineral Composition • Use a microscope to look at the size & shape of crystals to ID (identify) minerals in the rock. • Acid test- tests for carbonates. • Magnetic Test- tests for iron and nickel.

  11. Rock Cycle Igneous Sedimentary Pressure Metamorphic Molten Material

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