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In general how does the density of a light colored igneous rock differ from that of a dark colored igneous rock?
Light-coloured igneous rocks, such as granite, have a higher silica content and lower iron and magnesium than darker ones, such as basalt. Since iron and magnesium are very dense minerals, this makes darker igneous rocks more dense than lighter ones.
Light colored igneous rocks are less what than dark igneous rocks?
Dense. Light colored igneous rocks have lower density compared to dark colored igneous rocks due to their higher silica content, which results in slower cooling and the formation of larger crystals.
What is the difference between foliated and nonfoliated metamorphic rocks?
Foliation is a geologic term that is used to describe the banded or layered appearance of metamorphic rocks.Foliated metamorphic rocks such as gneiss display banding and regrouping of its mineral constituents as a result of enormous pressures and heat. The banding forms perpendicularly to the direction of pressure. The pressure is usually related to tectonic plate collisions. Schist is another type of foliated rock that exhibits thin layering of micaceous minerals, once again due to pressure and heat. The difference between these two foliated rocks lies in the rock from which they were derived (protolith) and their degree of metamorphism.Non-foliated metamorphic rocks such as quartzite and marble do not display the banding or layering that are present in foliated rocks. This may be partially due to the high relative percentage of one individual mineral in the parent rock, as well as to the metamorphic variables of heat and pressure.'Foliated' is a term used to describe metamorphic rocks whose grains are arranged in parallel layers.
Is schist foliated or non- foliated?
Chert is non-foliated. Foliation is a term that is used mainly to describe the appearance or texture of metamorphic rock. Chert is a sedimentary rock, composed mostly of microcrystalline quartz.
What is the most common metamorhic rock made from granite?
The most common metamorphic rock derived from granite is gneiss. Gneiss forms through high-grade metamorphism, where granite undergoes intense heat and pressure, resulting in a foliated texture characterized by alternating bands of light and dark minerals. This banding is a key feature that distinguishes gneiss from other metamorphic rocks.
What is a foliated dense rock that has light and dark colored banding?
Gneiss
A foliated dense rock that has light and dark colored banding?
The rock you are likely describing is gneiss, which is a metamorphic rock with alternating light and dark bands. Gneiss forms when intense heat and pressure cause the original rock to recrystallize, resulting in distinct layering of minerals.
Light-colored igneous rocks are less what than dark-colored igneous rocks are?
less dense
How does the density of a light colored rock differ from the density of dark colored rock?
Normally, light colored igneous rocks are less dense compared to dark colored igneous rocks. This is because the light colored rocks have a less iron in them.
How does the density of a light colored igneous rock differ from that of a dark colored igneous rock?
Normally, light colored igneous rocks are less dense compared to dark colored igneous rocks. This is because the light colored rocks have a less iron in them.
What type of rock has light and dark layers?
foliated.
What term is used to describe metamorphic rocks with a banded texture?
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.
In general how does the density of a light colored igneous rock differ from that of a dark colored igneous rock?
Light-coloured igneous rocks, such as granite, have a higher silica content and lower iron and magnesium than darker ones, such as basalt. Since iron and magnesium are very dense minerals, this makes darker igneous rocks more dense than lighter ones.
Is gneiss nonfoliated?
No. Gneiss has foliation in the form of alternating light and dark bands.
If a rock has bands of light and dark layers it is what?
It is likely a sedimentary rock, where the light layers are composed of a different material or grain size compared to the dark layers. This banding could be due to variations in sediment deposition over time.
Light colored igneous rocks are less what than dark igneous rocks?
Dense. Light colored igneous rocks have lower density compared to dark colored igneous rocks due to their higher silica content, which results in slower cooling and the formation of larger crystals.
What is a nonfoliated texture?
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. == == == ==
