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What is a rock's texture?
The texture of a rock consists of it's grain or mineral crystal size, the arrangement of the grains or crystals, and the degree of uniformity of the grains or crystals. Examples of rock texture would be: * Coarse grained--visible crystals or grains as in granite. * Fine grained--small grains, invisible to the unaided eye as in shale. * Porphyritic--large visible crystals in a fine grained matrix as in granite porphyry. * Schistose--layers of flattened micaceous minerals such as in mica schist. * Foliated--a metamorphic rock texture of parallel mineral banding as in gneiss. * Homogenous--same grain apperance in all directions as in basalt.
What is a non-foliated contact metamorphic rock called?
A non-foliated contact metamorphic rock is called a hornfels. Hornfels is called so because of its exceptional toughness and texture both reminiscent of animal horns.
Why does sedimentary rock buried into metamorphic?
Sedimentary rock is buried into metamorphic rock primarily due to tectonic processes, such as subduction, continental collision, or sediment compaction. As sedimentary layers accumulate over time, they can be subjected to increased pressure and temperature conditions deep within the Earth's crust. This environment triggers metamorphism, where the original sedimentary rock undergoes physical and chemical changes, resulting in the formation of metamorphic rock. The transformation often alters the texture, mineral composition, and structure of the rock.
What are foliated metamorphic rocks?
Foliated rocks have layers in them. We often refer to the layers as Banding.
A metamorphic rock that has no layers is called what?
It is called Non-foliated.
When a mineral grains in a metamorphic rock do not form layers the rock has a?
no texture
When mineral grains flatten and line up in layers a metamorphic rock has a?
A schistose texture.
A metamorphic rock that has grains arranged in parallel layers has a what texture?
It has a foliated texture.
What do metamorphic rocks with a non-foliated texture show metamorphic changes involve?
Metamorphic rocks with a non-foliated texture show that the metamorphic changes involved did not result in the development of a preferred alignment of mineral grains. This indicates that the rocks were subjected to directed pressure or high temperatures without causing the minerals to align into layers. Examples of non-foliated rocks include marble and quartzite.
When minerals grains flatten and line up in layers a metamorphic rocks has a texture?
A schistose texture.
What type of metamorphic rock is composed of mineral grains arranged in parallel layers?
Foliated.
What is a type of metamorphic rock in which mineral grains grow and rearrange but do not form layers?
schist
When metamorphic rock has banded texture with minerals grains that are arranged in layers it is called?
Metamorphic rocks with a layered or banded look are referred to as foliated.
When a metamorphic rock exhibits a layered or banded appearance it is said to exhibit what type of texture?
When a metamorphic rock exhibits a layered or banded appearance, it is said to exhibit foliated texture. This texture is a result of the alignment of mineral grains or the presence of alternating light and dark layers. Examples of foliated metamorphic rocks include gneiss and schist.
Metamorphic rocks such as marble and quartzite are said to be what because their mineral grains are not arranged in parallel layers or bands?
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.
Does metamorphic rock have layers?
Not exactly. Some metamorphic rocks have foliation, which can appear similar to the layers of sedimentary rock. Foliation develops from mineral grains being oriented by pressure, rather than the deposition of layers.
What is metamorphic rocks with a non-foliated texture show metamorphic change that involves?
Lesson 5: Metamorphic RocksScience 7 A Unit 2: Earth's Materials1. All of the following conditions in Earth can cause metamorphic rocks to form except _____. (1 point)(1 pt) exposure to air(0 pts) the presence of hot, watery fluids(0 pts) heat(0 pts) pressure1 /1 point2.Metamorphic rocks that show layers of dark minerals alternating with layers of light minerals are classified as _____. (1 point)(0 pts) nonfoliated(0 pts) detrital(1 pt) foliated(0 pts) intrusive1 /1 point3.Metamorphic rocks with a nonfoliated texture show metamorphic change that involves _____. (1 point)(0 pts) mineral grains arranging into layers(1 pt) growth in the size of the mineral grains(0 pts) mineral grains flattening under pressure(0 pts) mineral grains melting1 /1 point
