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Foliated is the correct answer!!!
It could be a sedimentary rock or a foliated metamorphic rock exhibiting alternating bands of light and dark minerals.
foliated metamorphic rocks. The alternating layers are caused by the alignment and segregation of minerals during the metamorphic process, resulting in a banded or layered appearance. Examples of foliated metamorphic rocks include gneiss, schist, and slate.
Foliated metamorphic rocks exhibit a layering affect with parallel layers of mineral crystals one on top of the other. A good example of this is gneiss, which has alternating layers of light and dark minerals. Foliation takes place when pressure is applied to crystals and they recrystallize or align themselves at right angles to the direction of the applied directional stress.
The bands of light and dark are classic signs of Gneiss (Gneissose banding), but Gneiss is not necessarily shiny. It may be sparkly, but not shiny. However, a Slate IS shiny, but does not have the pretty banding. Another consideration is Schist, which has similar characteristics to Gneiss. My advise is that if you are classifying a rock that you are looking at, consider the grade of metamorphism, as it certainly is metamorphic. Also consider the mineralogy: what are the light and dark bands? Quartz, Feldspar (light)? Mica (biotite) (dark)? There are many possibilities. The mineralogy will help determine the original sedimentary rock, which you can then use to determine the metamorphic sample you have.
Foliated is the correct answer!!!
Yes. This metamorphic rock can be made from granite; wavy bands of dark and light layers.
It could be a sedimentary rock or a foliated metamorphic rock exhibiting alternating bands of light and dark minerals.
It could be a sedimentary rock or a foliated metamorphic rock exhibiting alternating bands of light and dark minerals.
foliated metamorphic rocks. The alternating layers are caused by the alignment and segregation of minerals during the metamorphic process, resulting in a banded or layered appearance. Examples of foliated metamorphic rocks include gneiss, schist, and slate.
It could be foliated metamorphic rock or sedimentary rock, depending on its mineral makeup and method of formation.
Gneiss is a metamorphic rock which exhibits foliation (a layered effect). The layers of gneiss are alternating light and dark layers. Usually the lighter layers are rich in quartz and feldspar and the darker layers are rich in biotite mica, hornblende, or tourmaline.
gneiss
Foliated metamorphic rocks exhibit a layering affect with parallel layers of mineral crystals one on top of the other. A good example of this is gneiss, which has alternating layers of light and dark minerals. Foliation takes place when pressure is applied to crystals and they recrystallize or align themselves at right angles to the direction of the applied directional stress.
The bands of light and dark are classic signs of Gneiss (Gneissose banding), but Gneiss is not necessarily shiny. It may be sparkly, but not shiny. However, a Slate IS shiny, but does not have the pretty banding. Another consideration is Schist, which has similar characteristics to Gneiss. My advise is that if you are classifying a rock that you are looking at, consider the grade of metamorphism, as it certainly is metamorphic. Also consider the mineralogy: what are the light and dark bands? Quartz, Feldspar (light)? Mica (biotite) (dark)? There are many possibilities. The mineralogy will help determine the original sedimentary rock, which you can then use to determine the metamorphic sample you have.
foliated.
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.