Muscovite mica is generally less mafic and less dense than biotite mica. Muscovite is a potassium aluminum silicate, while biotite contains iron and magnesium, giving it a more mafic composition. As a result, biotite is denser than muscovite, which typically has a lower specific gravity due to its higher aluminum and silicon content.
Continental and oceanic crust are both less dense than mafic rocks. Continental crust is primarily composed of granitic materials, while oceanic crust is mainly basaltic, which is mafic in composition. However, basalt is denser than the average continental crust, making oceanic crust denser than continental crust but still less dense than pure mafic rocks. Therefore, in general, both types of crust are less dense than mafic materials.
== == Felsic lava has a higher silica content than mafic lava. Felsic lava is slower moving (high viscosity) than the less viscous mafic lava. Mafic lava is higher in dark minerals and higher in the elements iron and magnesium.
Gases are less dense than solids.
Mafic magma is high in magnesium and iron, has a low silica content, and is less viscous compared to felsic magma. Mafic lava typically produces dark-colored rocks like basalt and is associated with oceanic crust. Mafic magma tends to erupt more quietly and flow more easily due to its lower viscosity.
Mafic lava is more fluid and less viscous compared to felsic lava, which results in faster flows and smoother surfaces. It has a higher temperature and lower silica content, leading to less explosive eruptions and the formation of dark-colored rocks like basalt. Mafic lava typically originates from oceanic volcanoes and can cover large areas with thin, extensive lava flows.
Continental and oceanic crust are both less dense than mafic rocks. Continental crust is primarily composed of granitic materials, while oceanic crust is mainly basaltic, which is mafic in composition. However, basalt is denser than the average continental crust, making oceanic crust denser than continental crust but still less dense than pure mafic rocks. Therefore, in general, both types of crust are less dense than mafic materials.
Mafic rocks are generally denser than felsic rocks due to their higher content of iron and magnesium minerals. This higher density is attributed to the presence of heavier elements in mafic compositions.
Geologists use the terms felsic and mafic to describe the compositions of igneous rocks. Felsic rocks are rich in silicon and aluminum, making them lighter in color and less dense. Mafic rocks are richer in magnesium and iron, making them darker in color and denser.
Less than 45%
no
To determine which rock type has a greater percentage of biotite, you would typically compare different igneous or metamorphic rocks known for their biotite content. For example, granite often contains less biotite compared to schist or certain types of gneiss, which can have a higher percentage of biotite due to their metamorphic processes. If you have specific rock types in mind, I can provide a more tailored comparison.
Dense water sinks in comparison to less dense water.
== == Felsic lava has a higher silica content than mafic lava. Felsic lava is slower moving (high viscosity) than the less viscous mafic lava. Mafic lava is higher in dark minerals and higher in the elements iron and magnesium.
it is less dense
The value of a biotite rock can vary depending on factors such as size, quality, and demand. Generally, biotite is more common and less valuable than other minerals like diamonds or gold. It is often used for educational purposes, in jewelry, or as a collector's item.
Subduction only occurs on convergent plate boundaries, which means that the two plates are colliding. Subduction is basically the sinking of one plate below another. This happens when an oceanic plate and a continental plate collide, and the more dense oceanic plate filled with more mafic rock types (with magnesium/iron and less silica) slide under the less dense continental crust.
its has more pressure