Igneous Rocks Practice

Intrusive vs. Extrusive Igneous Rocks Intrusive form from magma form under Earth's surface cools slowly has large crystals would be found on the inside of a volcano coarse texture Extrusive form from lava form on or above Earth's surface cools quickly have small or no crystals would be found on the top of a volcano fine or glassy texture Igneous Rock Examples basalt mafic extrusive rock with no crystals that just looks black obsidian mafic extrusive rock that looks like glass pumice felsic extrusive rock that has lots of air bubbles and is very light granite felsic intrusive rocks with large crystals made of different minerals Identifying Igneous Rocks Copy and paste the names of the igneous rocks below. Remember that spelling counts!Word Bank:basaltgraniteobsidianpumice pumice obsidian granite basalt Mafic vs. Felsic Igneous Rocks Mafic igneous rocks are black or dark in color and contain a lot of iron. Felsic rocks are white or light in color and contain a lot of silica. How are basalt and granite similar? both form on Earth's surface both are intrusive rocks both are igneous rocks This property occurs when minerals break along a flat area of weakness. luster hardness fracture cleavage Metallic vs. Non-Metallic Minerals Metallic graphite pyrite galena Non-Metallic talc quartz mica