The thin flat layering found in most metamorphic rocks is called foliation
The thin flat layering found in most metamorphic rocks is called foliation, and it is formed due to the alignment of mineral grains or the presence of alternating layers of different mineral compositions. Foliation is a common feature in rocks that have undergone high pressure and temperature conditions, leading to the development of a layered structure.
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Planar rocks are rocks that have layering or bedding planes, which are flat surfaces where the rock has split or been deposited in distinct layers. These layers can be caused by sedimentation, metamorphism, or other geological processes. Planar rocks are commonly found in sedimentary and metamorphic rocks.
Mos flat rocks are sedimentary, with shale being a prime example. Shale forms from fine sediment being laid down in layers and then later hardened into rock, with the layers preserved. Slate is a metamorphic rock derived from shale that still preserves the layering.
Mos flat rocks are sedimentary, with shale being a prime example. Shale forms from fine sediment being laid down in layers and then later hardened into rock, with the layers preserved. Slate is a metamorphic rock derived from shale that still preserves the layering.
The two main groups of metamorphic rocks are foliated and non-foliated. Foliated metamorphic rocks show layering and parallel alignment of flat mineral crystals (ex. micas). The "banded texture in metamorphic rocks" is one of the specific kinds of foliated textures. It is referred to as gneissic banding. Essentially, this texture displays alternating layers of light and dark minerals. These rocks are called gneiss- the light bands form from quartz and feldspars, while the dark ones form from ferromagnesian minerals.
Rocks with grains that lie in flat layers are sedimentary rocks, which include sandstone and shale. Rocks with swirling patterns are often metamorphic rocks, such as gneiss or marble, which have undergone intense heat and pressure causing their minerals to align in distinct patterns.
The condition that produces distinct layers of flat and elongated minerals in foliated metamorphic rocks is directed pressure, which causes the minerals to align perpendicular to the direction of pressure. This pressure helps give the rock its characteristic layered structure, known as foliation.
The type of rock that breaks apart into flat planar sections is called a sedimentary rock, specifically those that exhibit layering, such as shale. Shale is composed of fine particles and clay minerals that align in such a way that it can split easily along these layers. This characteristic is due to the processes of sedimentation and compaction, which create distinct planes of weakness in the rock. Other types of rocks, like schist or gneiss, also exhibit foliation and can break in flat sections but are metamorphic in nature.
A non-foliated rock is a metamorphic rock that does not display a lamellar texture or distinct light and dark banding common to foliated metamorphic rocks. Non-foliated rock includes quartzite, marble, and metabasalt. Non-foliated metamorphic rocks are most often derived from single mineral sedimentary rocks like limestone and quartz sandstone. == == == ==
If you can find an open piece of dirt, you can find rocks. All rocks fallinto those three categories. If you find a flat, smooth piece of rock, you might have found slate, a metamorphic rock. However, most metamorphic rocks are hard to find in the New York area, as there are few plate tectonics in these parts. Anyhow, look for rocks and use this rock key: http://www.rockhounds.com/rockshop/rockkey/index.html
Mica is a mineral that often forms smooth flat sheets. It is known for its perfect cleavage and ability to be easily split into thin, flexible layers. Mica is commonly found in igneous and metamorphic rocks.