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Rock Classification and Characteristics Guide

Explore the composition, texture, and origin of rocks. Learn about key minerals like quartz and feldspar, as well as different grain sizes and patterns. Understand the rock cycle and how to identify minerals through tests.

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Rock Classification and Characteristics Guide

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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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