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.
Rocks develop a porphyritic texture due to magma going through a two stage cooling process. When the magma has cooled sufficiently underground, it allows some minerals to crystallize and grow in size.
A porphyroblastic texture occurs in a metamorphic rock when visible euhedral or near euhedral mineral crystals, such as garnet or staurolite, form and appear frequently in the the much finer grained groundmass. An example of a porphyroblastic texture would appear in a rock called garnet schist.
See link below for more information.
A porphyritic rock is an igneous rock that has larger crystals embedded in a finer groundmass. The textures are common in volcanic rocks.
A porphyritic texture is described as a rock with a fine-grained texture with a coarse-grained texture layered behind it.
A porphyritic texture is commonly found in volcanic rocks. The rocks often have distinct crystals or crystalline particles embedded in a fine-grained ground mass.
It has a porphyritic texture, a combination of visible crystals set in a matrix of fine grained crystals.
see link below
Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.
It's texture is porphyritic
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.
Rhyolite may be aphanitic or porphyritic.
Porphyritic
Porphyritic texture is a feature of some igneous rocks, not sedimentary rocks.
Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.
Typically porphyritic with hbl phenocrysts.
It's texture is porphyritic
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.
Rhyolite may be aphanitic or porphyritic.
Porphyritic
A porphyritic texture.
Yes
porphyritic
And their texture, which can be aphanitic, phaneritic, glassy, or porphyritic. mineral composition and crystal texture
Porphyritic texture is characterised by two distinctively different crystal sizes. Please see link.