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How can you determine if a igneous rock has had an intrusive or extrusive origin?
Wiki User
∙ 8y ago
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
Green Tremblay
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Igneous rocks with a two-stage intrusive-extrusive origin are recognized by a texture which is?
porphyritic
How do igneous rocks form and how are they classified?
Igneous rocks are formed by the cooling of lava (above Earth's surface) or magma (below). Rocks in general are classified by their mineral composition, texture, and origin. Igneous rocks all have the origin of molten material, there are two categories within this: intrusive and extrusive. Intrusive rocks formed below earth's surface and extrusive rocks above. Their mineral composition varies greatly and depends on each individual rock. The classification of igneous rocks in texture is linked to their origin. The texture of a rock is defined by its grain: can you see and feel the little rocks that make it up? If you can, that rock has a coarse grain, if you can't see the bits, it is fine grained. Intrusive igneous rocks are usually fine grained; extrusive, coarse grained.
What is origin of gabbro?
intrusive igneous rock
What is the comparison of granite and basalt in terms of origin and texture which is intrusive and which is extrusive?
Basalt can't see crystals and basalt is extrusive. Granite you can see the crystals and is intrusive.
Was igneous rocks were classified by their their origin texture and shape?
No, igneous rocks are not classified by their shape. They are primarily classified based on their origin (either intrusive or extrusive) and their texture (coarse-grained, fine-grained, glassy, etc.). Shape or form is not a major factor in the classification of igneous rocks.
What type of extrusive rock would form at a volcano?
Extrusive rock of an igneous origin, formed from the cooling and solidification of lava. Typical examples include basalt, andesite and rhyolite.
From what material does a extrusive rock form?
"Igneous" refers to rocks of volcanic origin. "Extrusion" refers to the process of a material being forced through a cavity of another material. (Think "Play-Doh Fun Factory." :) ) So, extruded igneous rocks are formed when liquid magma (volcanic rock) is forced through an opening (like a volcanic vent) and then cools and hardens into volcanic rock.
What is the similarities between intrusive and extrusive igneous rock?
Both are formed from the solidification of cooling magma.
What is the same about granite and obsidian?
Obsidian and granite are both igneous rocks. Obsidian is of extrusive origin (which means the magma cooled quickly) and has a glassy texture. Granite is of intrusive origin (which means the magma cooled slowly) and is phaneritic, or coarse grained.y
What is granites origin?
Granite is an intrusive igneous rock and comes from magma. It is a very hard, granular, crystalline rock that is mainly composed of quartz, mica, and feldspar.
What is the origin of Diorite?
an intrusive rock
What is the the origin of igneous?
Molten Magma.
