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Describe and explain the difference in the crystalline texture of volcanic rock and rock formed from an intrusion?
Wiki User
∙ 9y ago
The texture of intrusive igneous rocks is phaneritic, which is characterized by coarse-grained large crystals that are visible to the naked eye. The texture of volcanic rocks, meanwhile, is porphyritic, which is characterized by fine-grained crystals.
Wiki User
∙ 9y ago
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Is volcanic glass a mineral group?
No. By definition, a mineral must have a crystalline structure. Glass does not have a crystalline structure.
What is volcanic glass?
Volcanic glass is material produced by a volcano that lacks any sort of crystalline structure. While most rocks contain crystals in some form of another, glass does not. Volcanic glass usually forms when molten rock cools too quickly to form a crystalline structure. Examples of volcanic glass include obsidian, ash, pumice, and scoria.
Do all extrusive igneous rocks contain crystals?
No. Pure volcanic glasses contain no crystalline structure.
Are there igneous rocks that lack a crystal structure?
Obsidian, actually a volcanic glass, has no crystalline structure due to its quick solidification.
How is volcanic glass different from a mineral?
Volcanic glass does not technically contain mineral crystals. The definition of a mineral requires a crystalline structure. Secondly, the chemical composition of volcanic glass could vary widely. Minerals have definite parameters for chemical composition.
Is volcanic glass a mineral?
Volcanic glass is not a mineral. It's composition is complex, and their is no crystalline structure.
Is volcanic glass a mineral group?
No. By definition, a mineral must have a crystalline structure. Glass does not have a crystalline structure.
What minerals make up volcanic glass?
No minerals make up true volcanic glass, as the crystalline structure of minerals did not have time to form before the lava hardened. A mineral must have a crystalline structure.
When igneous rock from volcanic eruption cool what does it form?
When igneous rocks from a volcanic eruption cools it forms Crystalline Rocks.
Where can ores be formed?
In areas of volcanic intrusion, areas of hydrothermal deposition, and even in leached soils.
What does magma composition play a major role in?
The type of rock formed when the magma cools. The type of volcano or volcanic intrusion that is formed The explosiveness of volcanic eruptions.
What Two types of rocks that have no minerals?
Volcanic glasses have no crystalline structure, and technically no minerals.
What is volcanic glass?
Volcanic glass is material produced by a volcano that lacks any sort of crystalline structure. While most rocks contain crystals in some form of another, glass does not. Volcanic glass usually forms when molten rock cools too quickly to form a crystalline structure. Examples of volcanic glass include obsidian, ash, pumice, and scoria.
Do extrusive igneous rocks contain crystals?
No. Pure volcanic glasses contain no crystalline structure.
Do all extrusive igneous rocks contain crystals?
No. Pure volcanic glasses contain no crystalline structure.
What is a belonite?
A belonite is one of the minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.
Are there igneous rocks that lack a crystal structure?
Obsidian, actually a volcanic glass, has no crystalline structure due to its quick solidification.
