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Textures of volcanic rocks include aphantitic (mineral grains are present but microscopic) , porphyritic (some grains are visible to the naked eye), glassy (all or much of the rock lacks a crystalline structure), and vesicular (solidified gas bubbles are present).
Volcanic rocks can have a variety of textures depending on how they are formed. Common textures include glassy (smooth and shiny), vesicular (with holes from gas bubbles), and porphyritic (large crystals in a fine-grained matrix). Some volcanic rocks can also have a rough, jagged texture due to their sharp edges and angular features.
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What rock group does obsidan belong to?
Obsidian falls under the group of Extrusive Volcanic Rock of very fine texture. Obsidian is generally called Volcanic Glass.
What type of rock can be formed when volcanic rock is altered by heat and pressure?
Metamorphic rock, such as schist or gneiss, can be formed when volcanic rock is altered by heat and pressure. This process can cause the mineral composition and texture of the rock to change, resulting in a new type of rock with different features than the original volcanic rock.
What is fragmental texture?
Fragmental texture is a type of rock texture characterized by the presence of fragmented or broken rock particles that are welded together. These particles can vary in size and shape, often created by volcanic or explosive processes. Common examples include tuff and breccia.
What is a light porous volcanic rock called?
Pumice is a light, porous volcanic rock that is commonly used in beauty and skincare products for exfoliation. It forms when volcanic lava rapidly cools and traps gases, creating its characteristic porous texture.
What is the name of volcanic rock with air bubbles found at Mount Vesuvius?
The volcanic rock with air bubbles found at Mount Vesuvius is called pumice. Pumice forms when volcanic gases are rapidly released from magma during an eruption, creating a frothy texture with numerous air pockets.
What rock group does obsidan belong to?
Obsidian falls under the group of Extrusive Volcanic Rock of very fine texture. Obsidian is generally called Volcanic Glass.
What type of rock can be formed when volcanic rock is altered by heat and pressure?
Metamorphic rock, such as schist or gneiss, can be formed when volcanic rock is altered by heat and pressure. This process can cause the mineral composition and texture of the rock to change, resulting in a new type of rock with different features than the original volcanic rock.
What rocks have a pyroclastic texture?
Volcanic rocks such as tuff and ignimbrite typically have a pyroclastic texture. These rocks are formed from the accumulation of volcanic ash, pumice, and other volcanic fragments that are deposited during explosive volcanic eruptions. The fragments are welded together upon cooling to form a solid rock.
Describe the texture of obsidian?
Obsidian is a hard, dark volcanic rock that is formed by the rapid solidification of lava. Its texture is glassy and shiny black.
What texture refers to rocks composed mainly of mineral and volcanic fragments?
The texture that refers to rocks composed mainly of mineral and volcanic fragments is known as "clastic texture". This texture is characterized by the presence of distinct particles or fragments that are cemented together to form the rock.
What texture is a pumice?
Pumice is a volcanic rock that is so full of gas bubbles that is it very light, and rough surfaced.
What is fragmental texture?
Fragmental texture is a type of rock texture characterized by the presence of fragmented or broken rock particles that are welded together. These particles can vary in size and shape, often created by volcanic or explosive processes. Common examples include tuff and breccia.
What type of rock is tuff?
Tuff is a type of volcanic rock formed from volcanic ash and debris that has been compressed and cemented together. It has a light and porous texture due to the presence of air pockets and is commonly found in areas with volcanic activity.
How do Igneous rock with glassy textures?
An igneous rock with a glassy texture cooled from its' liquid state very quickly, an example of this would be obsidian, a volcanic glass.
What is a light porous volcanic rock called?
Pumice is a light, porous volcanic rock that is commonly used in beauty and skincare products for exfoliation. It forms when volcanic lava rapidly cools and traps gases, creating its characteristic porous texture.
Which rock is light has a rough texture and has many hollow spaces?
Pumice is a light-weight volcanic rock with a rough texture and many hollow spaces formed by gas bubbles during its rapid cooling process.
What is the name of volcanic rock with air bubbles found at Mount Vesuvius?
The volcanic rock with air bubbles found at Mount Vesuvius is called pumice. Pumice forms when volcanic gases are rapidly released from magma during an eruption, creating a frothy texture with numerous air pockets.
