Rhyolite | rock | serii.info
Answer to: Compare and contrast granite and rhyolite By signing up, you'll get thousands of step-by-step solutions to your homework questions. You. Mar 13, So I'm going to make a general comment and say that a granite is between the rocks is that one is plutonic and the other is volcanic. Chemically, granite and rhyolite are exactly the same. The difference between them lies in how fast they crystallized, or more specifically.
Why are granite and basalt more common than rhyolite and gabbro?
To set some ground rules: All of these are igneous rocks. Granite and rhyolite are considered felsic, while basalt and gabbro are mafic click here for more information on mafic and felsic.
Felsic rocks, in general, form the bulk of the continental plates, while mafic basalt forms the seafloor. Since the surface of the earth is covered by oceanic and continental crustal materials, granite and basalt are very common.
So far so good, but what about the rhyolite and gabbro? Let's think about the differences between intrusive and extrusive igneous rocks for a bit. Basalt is extrusive and comes out of volcanoes, but the lava had to come from somewhere.
This is where the concept of a "magma chamber" comes in - the subsurface source of liquid rock to feed an extrusive volcanic event. In simple terms, gabbro is just the cooled magma chamber for the basaltic flows that erupt at the surface.
Pumice is formed from lava that is full of gas.
The lava is ejected and shot through the air during an eruption. As the lava hurtles through the air it cools and the gases escape leaving the rock full of holes. Pumice is so light that it actually floats on water. Huge pumice blocks have been seen floating on the ocean after large eruptions. Some lava blocks are large enough to carry small animals. Pumice is ground up and used today in soaps, abrasive cleansers, and also in polishes.
How are granite and rhyolite the same, and how do they differ? | Socratic
Rhyolite is very closely related to granite. The difference is rhyolite has much finer crystals. These crystals are so small that they can not be seen by the naked eye. Rhyolite is an extrusive igneous rock having cooled much more rapidly than granite giving it a glassy appearance.
- How are granite and rhyolite the same, and how do they differ?
- Igneous Rocks
- Igneous Rocks Lesson #12
The minerals that make up rhyolite are quartz, feldspar, mica, and hornblende. Gabbros are dark-colored, coarse-grained intrusive igneous rocks. They are very similar to basalts in their mineral composition. They are composed mostly of the mineral plagioclase feldspar with smaller amounts of pyroxene and olivine.
Obsidian is a very shiny natural volcanic glass. When obsidian breaks it fractures with a distinct conchoidal fracture.
In what ways are granite and rhyolite similar,and how are they different?
Notice in the photo to the left how it fractures. Obsidian is produced when lava cools very quickly.
The lava cools so quickly that no crystals can form. When people make glass they melt silica rocks like sand and quartz then cool it rapidly by placing it in water. Obsidian is produced in nature in a similar way.