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Granite is a coarse grained igneous rock without Pyroxene.
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Does gabbro have crystals?
Yes. Gabbro is an intrusive igneous rock with visible mineral crystals.
What is a term that describes an igneous rock texture in which crystals are present but are not visible?
extrusive
What is the size of a crystal in an extrusive igneous rock?
Normally the crystals in extrusive igneous rock are small enough as to not be visible without magnification. The exception would be a porphyritic rock that has visible crystals dispersed in a fine-grained matrix. This type of rock represents a partial cooling of magma before expulsion by volcanism.
What are granite and basalt?
Both are igneous rocks, formed from the cooling and solidification of magma. Granite is a felsic, intrusive igneous rock, with visible well mixed mineral crystals. Basalt is a mafic, extrusive igneous rock, composed of darker mineral crystals, most of which are not distinguishable without the aid of magnification.
Can a sedimentary rock be directly transformed into a igneous rock?
Yes, by heat and pressure. It could turn into two types of igneous rocks: intrusive and extrusive. An intrusive igneous rock is formed by heat from a volcano. It is cooled slowly, and has big crystals. An extrusive igneous rock is formed outside a volcano. It cools slowly and has small/ not visible crystals. So basically, if the sedimentary rock gets into a volcano, it can turn into an igneous rock. Hope that answered your question.
What igneous rock has crystals that are not visible?
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
What is a black intrusive rock with small crystals?
Intrusive rock normally has visible crystals. Extrusive igneous rock has small crystals. A black extrusive igneous rock with small crystals could be basalt.
Does gabbro have crystals?
Yes. Gabbro is an intrusive igneous rock with visible mineral crystals.
How can you determine if a igneous rock has had an intrusive or extrusive origin?
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
What is a type of igneous rock that forms visible crystals?
Granite, gabbro, and diorite are a few igneous rocks that forms crystals. Igneous rocks that form visible crystals are intrusive igneous rocks, rocks that form under the earth's surface.
What is Granite crystal?
Granite is an igneous rock with visible mineral crystals.
You find an igneous rock with no visible mineral crystals were did this rock most likely form?
in a cave
What is a term that describes an igneous rock texture in which crystals are present but are not visible?
extrusive
What is an example of an intrusive igneous rock with large crystals?
Porphyrite of any composition, granite, gabbro, diorite. Most intrusive igneous rocks have crystals large enough to see with the naked eye. Another term used to define an igneous rock with large crystals is coarse-grained.
What is the size of a crystal in an extrusive igneous rock?
Normally the crystals in extrusive igneous rock are small enough as to not be visible without magnification. The exception would be a porphyritic rock that has visible crystals dispersed in a fine-grained matrix. This type of rock represents a partial cooling of magma before expulsion by volcanism.
What observation about an igneous rock would support the inference that the rock cooled slowly underground?
The rock would have visible mineral crystals--a phaneritic texture.
How can you identify an igneous rock?
Intrusive igneous rock is composed of visible mineral crystals, possessing what is referred to as a phaneritic texture. This is evidence that slow cooling of magma occurred deep underground.
