classifying rocks. are made of mixtures of minerals and other materials, although some may contain...
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Classifying Rocks
Classifying Rocks
• Are made of mixtures of minerals and other materials, although some may contain only a single mineral.– Granite• Quartz• Feldspar,• Mica• Hornblend
Rocks
• Size, shape and pattern of rock grains.– Grains- particles of minerals or other rocks.
Texture
• Coarse Grained- Large and easy to see.
• Fine Grained- small.
Texture (Grain Size)
• Grains vary widely.– Tiny particles of sand.– Look like seeds– Crystals– Smooth / rounded– Jagged
Texture (Grain Shape)
• Grains often form patterns.
– Some lie in flat layers.
– Rows of grains.
– Random grains.
Texture (Grain Pattern)
• 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)
Texture (No Visible Grain)
• 3 Groups- refers to how the rocks formed.
Origin
• 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.
Mineral Composition
Rock Cycle