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How does the silica content of an intermediate rock compare with that of felsic and mafic rock?
Intermediate rocks have a silica content that falls between felsic and mafic rocks. Felsic rocks typically contain more than 65% silica, while mafic rocks generally have less than 55%. Intermediate rocks usually contain about 55-65% silica, making them compositionally distinct and often resulting in different mineral content and characteristics compared to the other two rock types.
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Is peridotite felsic mafic intermediate or ultramafic?
Peridotite is ultramafic, composed predominantly of mafic minerals such as olivine and pyroxene. It has low silica content and high magnesium and iron content, making it different from felsic, intermediate, and mafic rocks.
What two rocks type are niether felsic nor mafic?
The two rock types that are neither felsic nor mafic are ultramafic and intermediate. Ultramafic rocks contain very low silica content and are primarily composed of olivine and pyroxene, while intermediate rocks have a silica content between that of felsic and mafic rocks, typically consisting of a mix of plagioclase feldspar and amphibole. Examples of ultramafic rocks include peridotite, and examples of intermediate rocks include andesite.
Does magma having a silica content of 50 percent is more mafic than one having a silica content of 70 percent?
No, magma with a silica content of 50 percent is more felsic, while magma with a silica content of 70 percent is more mafic. Silica content is inversely proportional to magma's mafic or felsic classification.
Which is not a compositional classification of a magma?
Chemical classification is not a compositional classification of magma. Compositional classifications include mafic, intermediate, and felsic based on the silica content of the magma.
What igneous compositions has the lowest silica content mafic ultra mafic intermediate or felsic?
Mafic igneous compositions have the lowest silica content, followed by ultramafic compositions. Mafic rocks are rich in magnesium and iron and have silica contents ranging from 45-52%. Ultramafic rocks have even lower silica content, typically below 45%.
What is the difference between felsic intermediate and mafic igneous rocks?
Silica content increases from mafic to felsic, and Mg and Fe content decreases. These differences affect things such as viscosity, density and colour. Felsic magmas are the most viscous and least dense, and felsic rocks are the lightest in colour.
Which rock is most felsic out of rhyolite andesite and basalt?
Rhyolite is the most felsic rock out of rhyolite, andesite, and basalt. Felsic rocks have a higher silica content and are associated with continental crust. Rhyolite is typically light in color and has a high silica content, making it more felsic compared to andesite and basalt.
Is peridotite felsic mafic intermediate or ultramafic?
Peridotite is ultramafic, composed predominantly of mafic minerals such as olivine and pyroxene. It has low silica content and high magnesium and iron content, making it different from felsic, intermediate, and mafic rocks.
What are the 3 types of magma?
basaltic magma ,Andesitic magma and Rhyolitic magma
Is pumice in a example of a mafic igneous rock?
No, pumice is an example of a felsic igneous rock. Mafic rocks, like basalt, have lower silica content and higher iron and magnesium content compared to felsic rocks, like pumice, which have higher silica content and lower iron and magnesium content.
What two rocks type are niether felsic nor mafic?
The two rock types that are neither felsic nor mafic are ultramafic and intermediate. Ultramafic rocks contain very low silica content and are primarily composed of olivine and pyroxene, while intermediate rocks have a silica content between that of felsic and mafic rocks, typically consisting of a mix of plagioclase feldspar and amphibole. Examples of ultramafic rocks include peridotite, and examples of intermediate rocks include andesite.
Is sandstone felsic or mafic?
Neither. The terms mafic and felsic refer to the composition of igneous rocks, which are dominated by silicate minerals. Marble is a metamorphic rock composed of carbonate minerals. The terms mafic and felsic do no apply to it.
Does magma having a silica content of 50 percent is more mafic than one having a silica content of 70 percent?
No, magma with a silica content of 50 percent is more felsic, while magma with a silica content of 70 percent is more mafic. Silica content is inversely proportional to magma's mafic or felsic classification.
Which is not a compositional classification of a magma?
Chemical classification is not a compositional classification of magma. Compositional classifications include mafic, intermediate, and felsic based on the silica content of the magma.
What igneous compositions has the lowest silica content mafic ultra mafic intermediate or felsic?
Mafic igneous compositions have the lowest silica content, followed by ultramafic compositions. Mafic rocks are rich in magnesium and iron and have silica contents ranging from 45-52%. Ultramafic rocks have even lower silica content, typically below 45%.
Name two rocks from the intermediate family?
Diorite and andesite are two rocks from the intermediate family. These rocks are formed through the cooling and solidification of magma with intermediate silica content, between that of felsic (granitic) and mafic (basaltic) rocks.
Is mauna loa mafic or felsic?
The 1980 eruption of Mount St. Helens produced dacite, which has an intermediate-felsic composition.
