How are light colored igneous rocks different?

Answer 1

Igneous rocks are divided into four groups based on their composition (often determined by observing density and color).

• Felsic (also called Silicic) igneous rocks have a lower density, and are generally lighter in color (white, tan, pink). They have a higher silica content and a lower iron and magnesium content than the other types of rock. Granite and rhyolite are felsic igneous rocks.
• Intermediate igneous rocks have a density between felsic and mafic rocks. They have a high silica content and a medium iron and magnesium content. These rocks are usually gray or a similar, medium-toned color. Andesite and diorite are intermediate igneous rocks.
• Mafic igneous rocks are quite dense, and have a much higher iron and magnesium content than felsic or intermediate igneous rocks. Mafic rocks are usually black or blackish. Gabbro and basalt are mafic igneous rocks.
• Ultramafic igneous rocks are the densest type, and have the highest iron and magnesium content. Ultramafic rocks are usually (surprise!) green. Peridotite is an ultramafic igneous rock.

Answer 2

They are generally higher in silicate minerals than darker igneous rocks.

Answer 3

Igneous rocks are dried clumps of molten lava.

Felsic rocks tend to be the light colored ones (white, pink or yellow).

Answer 4

The felsic igneous rock pumice is generally light colored and lighter than water.

Answer 5

If you are referring to igneous rocks, they are classified as felsic.

Answer 6

Granitic