The descriptive term is foliated.
The parallel crystal arrangement of layers in metamorphic rock is called foliation. Foliation is a common feature in rocks that have undergone intense heat and pressure, resulting in the alignment of mineral grains into distinct layers.
Metamorphic rocks with grains arranged randomly are said to be non-foliated. This means they do not have a layered or banded structure like foliated metamorphic rocks. Examples include marble and quartzite.
When rock layers form parallel to each other, it is called stratification. This process occurs when sediments settle and accumulate in horizontal layers over time, resulting in distinct bands or layers of rock.
In subject of metamorphic rocks, to be foliated is to have their grains arranged in parallel layers or bands. Non foliated is when the rocks' grains are made randomly in no arranged pattern.Reference:Prentice Hall Earth Science 2009
Gneiss is a type of rock that has parallel bands of dark and light mineral grains. These bands are a result of the rock being subjected to high temperatures and pressures during its formation, causing the minerals to align in distinct layers.
The descriptive term is foliated.
Magma that has fallen out a volcano to make sediments through metamorphism.
It has a foliated texture.
Foliated.
Foliated rocks, and in particular: * Shale * Schist * Gneiss
Metamorphic rocks such as marble and quartzite are said to be non-foliated because their mineral grains are not arranged in parallel layers or bands like in foliated rocks such as slate or schist. This lack of alignment gives non-foliated rocks a more uniform texture and appearance.
The parallel crystal arrangement of layers in metamorphic rock is called foliation. Foliation is a common feature in rocks that have undergone intense heat and pressure, resulting in the alignment of mineral grains into distinct layers.
Metamorphic rocks with a layered or banded look are referred to as foliated.
Metamorphic rocks with grains arranged randomly are said to be non-foliated. This means they do not have a layered or banded structure like foliated metamorphic rocks. Examples include marble and quartzite.
Sedimentary rocks are the type of rocks that are mostly arranged in layers. The way in which the layers are arranged is commonly called bedding.
Generically it is displaying a metamorphic fabric, specifically a schistosity. If the fabric is well developed it could also be displaying planes of cleavage.
A banded mineral is a mineral that has grains that are arranged in a particular pattern of flat layers or forms swirls.