Igneous Rocks and Their Minerals

The video tutorial discusses the mineral composition of igneous rocks and how it relates to their color. It covers different types of igneous rocks, including felsic granitic, intermediate and acidic, mafic basaltic, and ultramafic rocks. Each type is characterized by specific minerals and colors, such as light-colored quartz and potassium feldspar in felsic rocks, intermediate colors in rocks with hornblende and plagioclase feldspar, dark colors in mafic rocks with hornblende and augite, and green shades in ultramafic rocks with augite and olivine.

What are the primary minerals found in felsic granitic igneous rocks?

• Quartz and potassium feldspar

• Hornblende and plagioclase feldspar

• Augite and olivine

• Hornblende and augite

How would you describe the color of felsic granitic igneous rocks?

• Intermediate

• Dark

• Green

• Light

Which minerals are predominant in intermediate and acidic igneous rocks?

• Augite and olivine

• Hornblende and plagioclase feldspar

• Hornblende and augite

• Quartz and potassium feldspar

What texture is associated with intermediate igneous rocks?

• Porphyritic

• Phaneritic

• Aphanitic

• Glassy

What is the color characteristic of mafic basaltic igneous rocks?

• Intermediate

• Light

• Dark

• Green

Which minerals are found in mafic basaltic igneous rocks?

• Quartz and potassium feldspar

• Hornblende and plagioclase feldspar

• Hornblende and augite

• Augite and olivine

What is the primary color of ultramafic igneous rocks?

• Dark

• Intermediate

• Green

• Light

Which minerals are predominant in ultramafic igneous rocks?

• Augite and olivine

• Hornblende and augite

• Hornblende and plagioclase feldspar

• Quartz and potassium feldspar

What is a challenge when identifying minerals in ultramafic rocks?

• The minerals are both dark colored

• The minerals have similar green shades

• They have a glassy texture

• They are too light in color

If an igneous rock is green, what is it most likely to be?

• Felsic

• Intermediate

• Mafic

• Ultramafic