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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.


The igneous rock texture characterized by two distinctly different crystal sizes is the texture?

Porphyritic


This igneous texture is characterized by two distinctively different crystal sizes?

The igneous texture characterized by two distinctively different crystal sizes is known as porphyritic texture. Porphyritic rocks have larger crystals (phenocrysts) surrounded by a fine-grained matrix (groundmass), indicating two different stages of cooling within the magma.


Igneous rocks are classified based upon their mineral composition and?

And their texture, which can be aphanitic, phaneritic, glassy, or porphyritic. mineral composition and crystal texture


Is granite rock porphyritic?

Granite rock is not porphyritic. It is phaneritic because it has a coarse-grained texture.


What is the texture of an igneous rock from magma that cools in two stages?

It's texture is porphyritic


Is rhyolite's texture a aphanitic?

Rhyolite may be aphanitic or porphyritic.


What is the texture of adakite?

Typically porphyritic with hbl phenocrysts.


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.


Why is mineral texture an important aspect of petrography?

Mineral texture provides clues as to the origin of the rock particles and the processes which lead to the rock's formation. Texture would include the size and arrangement of the mineral crystals or particles found in the body of a rock.


Are sedimentary rocks that form when minerals come out of a solution classified as porphyritic?

No. I believe they are called chemical precipitate sedimentary rocks. Yes, I'm sure they're called that. Absolutely! Porphyritic is a term usually applied to igneous rocks, having to do with mineral formation and rock texture.


What texture does a volcanic rock have?

Textures of volcanic rocks include aphantitic (mineral grains are present but microscopic) , porphyritic (some grains are visible to the naked eye), glassy (all or much of the rock lacks a crystalline structure), and vesicular (solidified gas bubbles are present).