Magma that has fallen out a volcano to make sediments through metamorphism.
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.
Metamorphic rocks with a layered or banded look are referred to as foliated.
Generically it is displaying a metamorphic fabric, specifically a schistosity. If the fabric is well developed it could also be displaying planes of cleavage.
Mica has a unique structure that is made up of layers of silicate minerals. These layers are arranged in such a way that they are weakly bonded together, allowing mica to easily be split into thin parallel sheets. This property is known as basal cleavage.
The process of grains joining together to form sedimentary rock is called compaction. As layers of sediment accumulate on top of each other, the weight from the overlying layers squeezes out water and air between the grains, causing them to compact and bind together.
Rocks with grains arranged in parallel layers are called sedimentary rocks. These rocks form when sediment such as sand, mud, or organic material is deposited and compacted over time. Examples include sandstone and shale.
The descriptive term is foliated.
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.