1. Made from Magma and Lava
Igneous Rocks
Made from Magma and Lava

2. Igneous Rocks
Rocks that form from solidification of magma or lava (crystallizes)

3. Texture
Intrusive or plutonic - inside the earth’s crust, magma chambers.
Large crystals (>1mm)

4. Texture Extrusive or volcanic - lava on the earth’s surface.
Small or no crystals (< 1mm)

5. What do igneous rocks look like?
Texture can be glassy, fine grained, coarse grained, or very coarse grained

6. What do igneous rocks look like?
Vesicular = gas bubbles (extrusive) Or
Nonvesicular = no gas bubbles

7. Composition
Felsic light in color and density, rich in aluminum (continental crust) or
Mafic dark in color and high in density, rich in iron and magnesium (ocean crust)

8. Classification (ID) Crystals (YES!) Intrusive or Extrusive
Cooled slowly in the crust = large minerals Intrusive
Cooled rapidly on the surface = no or very small minerals Extrusive
Vesicular = very gaseous lava flow
Color: Light(Felsic) or dark (Mafic)

9. What are igneous rocks used for?