Igneous Rock Flashcard

Front

What is the category of igneous rock that has no crystals at all?

Back

Glassy

Front

What happens to minerals in magma as it cools?

Back

Different minerals form as the magma cools through time.

Front

What is the name of a felsic, intrusive (phaneritic) igneous rock?

Back

Granite

Front

What is the name of a felsic, extrusive glassy igneous rock that is frothy due to many vesicles (bubbles)?

Back

Pumice

Front

What category of igneous rock has mineral crystals that are large enough to identify without a microscope?

Back

Phaneritic/Intrusive

Front

What is the definition of igneous rock?

Back

Igneous rock is formed from the solidification of molten rock material (magma or lava).

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive rocks form from magma that cools slowly beneath the Earth's surface, while extrusive rocks form from lava that cools quickly on the surface.

Front

What is aphanitic texture in igneous rocks?

Back

Aphanitic texture refers to igneous rocks that have crystals too small to be seen without a microscope.

Front

What is the primary mineral composition of granite?

Back

Granite is primarily composed of quartz, feldspar, and mica.

Front

What is the significance of vesicles in pumice?

Back

Vesicles are gas bubbles trapped in the rock, giving pumice its light, frothy texture.