Podcast
Questions and Answers
What is the term used to describe very fine-grained igneous rocks?
What is the term used to describe very fine-grained igneous rocks?
Which type of igneous rock texture is characterized by the presence of both coarse and fine-grained minerals?
Which type of igneous rock texture is characterized by the presence of both coarse and fine-grained minerals?
Which type of igneous rock texture is formed when magma or lava cools very quickly, resulting in a glassy appearance?
Which type of igneous rock texture is formed when magma or lava cools very quickly, resulting in a glassy appearance?
What is the term used to describe the ejection of fragmented rock material from a volcanic eruption?
What is the term used to describe the ejection of fragmented rock material from a volcanic eruption?
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Which type of igneous rock texture is characterized by very large, coarse-grained minerals?
Which type of igneous rock texture is characterized by very large, coarse-grained minerals?
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What is the name given to the rough, jagged surface of an aa lava flow?
What is the name given to the rough, jagged surface of an aa lava flow?
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What type of igneous rock has a glassy texture?
What type of igneous rock has a glassy texture?
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Which type of igneous material is formed by explosive volcanic eruptions?
Which type of igneous material is formed by explosive volcanic eruptions?
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What type of igneous rock has a coarse-grained, pegmatitic texture?
What type of igneous rock has a coarse-grained, pegmatitic texture?
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Which type of lava flow has a rough, clinkery surface?
Which type of lava flow has a rough, clinkery surface?
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Which of the following is an extrusive igneous rock?
Which of the following is an extrusive igneous rock?
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What is the main difference between intrusive and extrusive igneous rocks?
What is the main difference between intrusive and extrusive igneous rocks?
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What category of igneous rocks contains more light-colored feldspars and silica than dark-colored minerals?
What category of igneous rocks contains more light-colored feldspars and silica than dark-colored minerals?
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Which type of igneous rock is known for containing mostly darker silicate minerals and calcium-rich plagioclase feldspar, with little quartz?
Which type of igneous rock is known for containing mostly darker silicate minerals and calcium-rich plagioclase feldspar, with little quartz?
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What is the primary mineral in granitic rocks that makes up about 70% of the Earth's crust?
What is the primary mineral in granitic rocks that makes up about 70% of the Earth's crust?
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Which type of igneous rock tends to be more dense than granitic rocks?
Which type of igneous rock tends to be more dense than granitic rocks?
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What category of igneous rocks has a composition between granites and basalts, with approximately 25% dark silicate minerals?
What category of igneous rocks has a composition between granites and basalts, with approximately 25% dark silicate minerals?
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What is the term used for basaltic lava that has a rough, jagged surface texture?
What is the term used for basaltic lava that has a rough, jagged surface texture?
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Study Notes
Igneous Rock Textures & Terms
- Aphanitic describes very fine-grained igneous rocks.
- Porphyritic texture is characterized by the presence of both coarse and fine-grained minerals.
- Glassy texture is formed when magma or lava cools very quickly, resulting in a glassy appearance.
- Pyroclastic refers to the ejection of fragmented rock material from a volcanic eruption.
- Phaneritic texture is characterized by very large, coarse-grained minerals.
- A'a lava flows have a rough, jagged surface called clinkers.
- Igneous rocks with glassy textures are called obsidian.
- Pyroclastic rocks are formed by explosive volcanic eruptions.
- Pegmatite is an igneous rock with a coarse-grained, pegmatitic texture.
- A'a lava flows have a rough, clinkery surface.
- Rhyolite is an extrusive igneous rock.
- Intrusive igneous rocks cool slowly beneath the Earth's surface while extrusive igneous rocks cool quickly above the surface.
- Felsic igneous rocks contain more light-colored feldspars and silica than dark-colored minerals.
- Mafic igneous rocks are known for containing mostly darker silicate minerals and calcium-rich plagioclase feldspar, with little quartz.
- Quartz is the primary mineral in granitic rocks that makes up about 70% of the Earth's crust.
- Mafic igneous rocks tend to be more dense than granitic rocks.
- Intermediate igneous rocks have a composition between granites and basalts, with approximately 25% dark silicate minerals.
- A'a lava with a rough, jagged surface texture is called blocky lava.
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Description
Test your knowledge on the origin of magma in relation to plate tectonics, Bowen’s Reaction Series, mineral crystallization, melting temperatures, rock compositions, textures, and classification of igneous rocks.
