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Igneous rocks

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This document describes different types of volcanic and plutonic rocks. It shows that magma is a mixture of melted rock and gases that can solidify into either plutonic or volcanic rocks. Plutonic rocks like granite form deep underground, while volcanic rocks such as basalt and obsidian form above ground during volcanic eruptions and have distinct characteristics based on their composition and texture.

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Igneous rocks
lava Volcanic rocks MAGMA mixture of melted rock and gases Plutonic rocks
Plutonic (intrusive) granite syenite pegmatite • made up of quartz, feldspars • made up of pink feldspar • composition similar to and some mica and other and black mica granite minerals • large crystals Volcanic (extrusive) basalt pumice obsidian • heavy and hard • light weight and floats in water • black and smooth • dark or black colour • light colours • looks like black glass • may have bubble holes • spongy texture • the edges can cut

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Igneous rocks

  • 2. lava Volcanic rocks MAGMA mixture of melted rock and gases Plutonic rocks
  • 3. Plutonic (intrusive) granite syenite pegmatite • made up of quartz, feldspars • made up of pink feldspar • composition similar to and some mica and other and black mica granite minerals • large crystals Volcanic (extrusive) basalt pumice obsidian • heavy and hard • light weight and floats in water • black and smooth • dark or black colour • light colours • looks like black glass • may have bubble holes • spongy texture • the edges can cut