0
There are 2 or more very distinct grain sizes.
The smaller grains are called phenocrysts and
the material around it is called matrix or
groundmass. The phenocrysts are 0.3 - 5 mm.
To truly see what a porphyritic texture looks like
just search on Google images and you'll see a nice
example along with a diagram that explains it.
What else can I help you with?
What are porphyritic rocks?
Porphyritic Rocks are rocks that have big and small crystal's like the Igneous Rock "Andesite".
Is granite rock porphyritic?
Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.
Which of the following is not a feature of sedimentary rock?
Porphyritic
Is sedimentary rock that forms classified as porphyritic?
yes
What is the cooling rate of a porphyritic rock?
The cooling rate of a porphyritic rock can vary depending on the specific conditions during its formation, but generally it is considered to be intermediate. This means that porphyritic rocks cool at a moderate rate, which allows for the formation of both large crystals (phenocrysts) and finer-grained matrix.
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.
What term denotes the larger mineral grains in a porphyritic igneous rock?
Phenocrysts are the larger mineral grains in a porphyritic igneous rock. These crystals are surrounded by a finer-grained matrix known as the groundmass. The presence of phenocrysts helps in understanding the cooling history of the rock.
What is the texture of an igneous rock from magma that cools in two stages?
It's texture is porphyritic
What terms are used to donate the larger crystals in a porphyritic rock?
The large crystals are known as phenocrysts.
The igneous rock texture characterized by two distinctly different crystal sizes is the texture?
Porphyritic
What is the texture of adakite?
Typically porphyritic with hbl phenocrysts.
What is a rock with cyrstals surrounded by small crystals called?
Ah, a classic. It is porphyritic. The classic example is granite.
