Made from Magma and Lava Igneous Rocks Made from Magma and Lava

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

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

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

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

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

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)

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)

What are igneous rocks used for?