Rock Textures
Definitions
Rock Identification
Mafic, Felsic, or Intermediate
Other
100
What texture do rocks composed of large crystal grains have?
Coarse-Grained Igneous Rocks
100
This type of rock forms when molten rock cools and becomes a solid.
Igneous Rock
100
What is a rock formed from the cooling and solidification of magma beneath Earth's surface?
Intrusive Igneous Rocks
100
Dark colored igneous rocks are which?
MAFIC
100
Lava that cools quickly will form extrusive igneous rocks that have (large crystals/small crystals).
What are small crystals?
200
What texture do many extrusive igneous rock that are composed of small crystal grains that cannot be seen by the unaided eye have?
Fine-Grained Igneous Rocks
200
Molten rock on Earth's surface is called______.
What is lava?
200
What is a rock that forms from the cooling and solidification of lava at Earth's surface?
Extrusive Igneous Rock
200
Light colored igneous rocks are which?
FELSIC
200
Magma that cools slowly will form intrusive igneous rocks that have (large crystals/small crystals).
What are large crystals?
300
What is the rapid cooling process that produces a rock full of gas pockets called?
Vesicular
300
Molten rock beneath Earth's surface is called ______.
Magma
300
A fine grained, dark, extrusive igneous rock.
What is Basalt or Diabase?
300
Diorite has both light and dark colors in it and will have what type of composition (Felsic/Mafic/Intermediate)?
Intermediate (average of both)
300
A rock with small crystals would be an (intrusive/extrusive)igneous rock.
EXTRUSIVE
400
Igneous rocks that cool super fast, and have no crystals have what kind of texture?
Glassy
400
What describes magma or igneous rock that is rich in silicon and aluminum and that is generally light in color?
Felsic
400
This rock is light in color, extrusive, and vesicular and does not form crystals
What is Pumice?
400
Dunite is considered Felsic, Mafic, or Intermediate?
Mafic
400
A rock with large crystals would be an (intrusive/extrusive)igneous rock.
INTRUSIVE
500
This rock appears to be black, is more felsic, and has a glassy texture.
Obsidian
500
What describes magma or igneous rock that is rich in magnesium and iron and that is generally dark in color?
Mafic
500
This Rock's mineral composition includes only Pyroxene and Olivine.
What is Peridotite?
500
A rock that has a mixture of light and dark colors.
Intermediate
500
Granite, rhyolite, and pumice have the same composition, but look very different because_____________________ ______________________.
Granite: intrusive igneous rock, slow cooling time produced large crystals Rhyolite:began cooling within Earth producing large/medium sized crystals and then rose to the surface and cooled quickly producing small crystals (extrusive) Pumice:extrusive igneous rock, fast cooling time produced small crystals
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