Igneous Rock Identification and Characteristics

The video tutorial explains the igneous rock identification diagram from the Earth Science Reference Table. It covers the characteristics of igneous rocks, including environment, crystal size, and texture, and differentiates between intrusive and extrusive rocks. The tutorial compares granite and gabbro, highlighting differences in color, density, and mineral composition. It also provides examples of how to use the diagram to answer typical questions, focusing on identifying rocks based on their characteristics and mineral content.

What are the three main parts of the igneous rock identification diagram?

• Mineral compositions, rock cycle, and rock types

• Rock types, crystal size, and texture

• Igneous rocks, sedimentary rocks, and metamorphic rocks

• Igneous rocks, characteristics, and mineral compositions

What is the primary difference between extrusive and intrusive igneous rocks?

• Extrusive rocks form underground, while intrusive rocks form above ground

• Extrusive rocks have larger crystals, while intrusive rocks have smaller crystals

• Extrusive rocks are denser than intrusive rocks

• Extrusive rocks form above ground, while intrusive rocks form underground

Which characteristic is NOT associated with granite?

• High density

• Intrusive formation

• Coarse, non-vesicular texture

• Felsic composition

How does gabbro differ from granite?

• Gabbro is lighter in color and less dense

• Gabbro has a finer texture

• Gabbro is extrusive

• Gabbro is darker in color and more mafic

What is the composition of gabbro?

• High in iron and magnesium

• High in silicon and aluminum

• High in potassium and sodium

• High in calcium and carbon

Which rock is identified as vesicular rhyolite?

• A rock that is made entirely of olivine

• A rock that is dark, dense, and mafic

• A rock that is light, low density, and felsic

• A rock that is coarse and non-vesicular

What is the primary mineral composition of dunite?

• Pyroxene and plagioclase

• Biotite and amphibole

• Olivine

• Quartz and feldspar

Which igneous rock is characterized by a fine texture and vesicular structure?

• Dunite

• Vesicular rhyolite

• Gabbro

• Granite

What does a felsic composition indicate about an igneous rock?

• It is high in calcium and carbon

• It is high in silicon and aluminum

• It is high in iron and magnesium

• It is high in potassium and sodium

Which rock is identified by having 100% olivine?

• Vesicular rhyolite

• Dunite

• Gabbro

• Granite