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Is granite rock porphyritic?
Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.
What affects the grain size of igneous rock?
Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.
What determines the mineral grain size in an igneous rock?
The cooling rate of the rock.
What is a porphyritic texture?
A porphyritic texture is displayed in an igneous rock containing large isolated crystals (phenocrysts) in a mass of fine textured crystals . Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.See link below for a picture of a porphyritic texture in a rock.
What Mineral alignment in a metamorphic rock usually gives the rock a porphyritic texture?
A porphyritic texture can be a feature of igneous rocks, but 'porphyritic' is not used to describe metamorphic rock texture. Metamorphic rocks can be foliated or non-foliated, terms used to describe mineral alignment or banding, or the lack thereof.
Is granite rock porphyritic?
Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.
Which igneous rock cools the fastest glassy aphanitc pegmatic and porphyritic?
Glassy igneous rocks cool the fastest. The most likely had more nucleation. Pegmatic cooled the slowest, which is why its crystals are larger than 1 cm. Phaneritic is the next slowest in cooling. Porphyritic has slow then rapid cooling, while aphanitic igneous rocks also have rapid cooling.
A coarse-grained rock and a fine-grained rock probably had different .?
Cooling rate
Is porphyritic rock extrusive or intrusive?
A porphyritic igneous rock is one with a texture containing large isolated crystals (phenocrysts) in a mass of fine grained crystals . Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.
What are porphyritic rocks?
Porphyritic Rocks are rocks that have big and small crystal's like the Igneous Rock "Andesite".
Which of the following is not a feature of sedimentary rock?
Porphyritic
What affects the grain size of igneous rock?
Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.
What is the cooling rate of a coarse grained igneous rock?
Coarse grained igneous rock is formed from the slow cooling of magma.
What determines the mineral grain size in an igneous rock?
The cooling rate of the rock.
What is a groundmass?
fine grained material in a porphyritic rock
Is sedimentary rock that forms classified as porphyritic?
yes
What is a porphyritic texture?
A porphyritic texture is displayed in an igneous rock containing large isolated crystals (phenocrysts) in a mass of fine textured crystals . Porphyritic texture indicates that a magma has gone through a two stage cooling process. The magma has cooled sufficiently underground to allow some minerals to crystallize and grow in size; the magma is then expelled above ground where the remaining liquid magma solidifies quickly, allowing only small crystals to develop.See link below for a picture of a porphyritic texture in a rock.
