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15 Cards in this Set

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What are the two main categories of igneous rocks?
Intrusive and Extrusive
What do felsic igneous rocks have a high percentage of?
Silicon (Si) and Aluminum (Al)
What do mafic igneous rocks have a high percentage of?
Iron (Fe) and Magnesium (Mg)
What textures can intrusive igneous rocks have?
Coarse or Very Coarse
What textures can extrusive igneous rocks have?
Glassy, Fine, or Vesicular
Describe a vesicular texture.
The rock has small air holes that formed when the lava cooled around gas bubbles.
What type of igneous rocks forms from lava?
Extrusive
What type of igneous rocks forms from magma?
Intrusive
Describe the relationship between the cooling rate of magma/lava and the size of the crystals in an igneous rock.
The longer the cooling time the bigger the crystals.
Describe the relationship between color and density in igneous rocks.
Lighter colored rocks tend to be less dense than darker colored rocks.
What is the relationship between rocks like Andesite and Diorite and the minerals Quartz and Pyroxene?
Maybe the minerals are present in the rocks, maybe not (see ESRT).
What is another name for Hornblende?
Amphibole (ESRT p. 16)
Where do intrusive igneous rocks form?
Inside of earth, or below the earth's surface
Where do exrusive igneous rocks form?
At, or above, earth's surface
What processes are involved in the formation of an igneous rock?
Melting and solidification. (ESRT rock cycle)