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.
Ultramafic igneous rocks are comprised mostly of olivine and pyroxene. Examples include peridotite (pegmatic and porphyritic) and komatite.
Porphyritic texture is a feature of some igneous rocks, not sedimentary rocks.
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
phenocryst
Such rocks are called porphyritic.
Ultramafic igneous rocks are comprised mostly of olivine and pyroxene. Examples include peridotite (pegmatic and porphyritic) and komatite.
Porphyritic Rocks are rocks that have big and small crystal's like the Igneous Rock "Andesite".
Porphyritic texture is a feature of some igneous rocks, not sedimentary rocks.
Porphyritic igneous rocks can display both intrusive and extrusive characteristics.
phenocryst
Such rocks are called porphyritic.
porphyritic
It's texture is porphyritic
Rhyolite porphyry. See link below for image.
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.
The type of igneous rock that has large crystals surrounded by smaller crystals is not a rock but a porphyritic texture. This texture describes igneous rock that has porphyrites, or large crystals, with surrounding tiny particles, or groundmass.