What is the composition of Felsite?
Felsite is a fine-grained, volcanic rock of light colour and is composed mainly of feldspar and quartz. It may also contain phenocrysts (>>>porphyry).
Is Felsite intrusive or extrusive?
extrusive igneous rocks
Felsite. Felsite is a general name for light-colored extrusive igneous rocks.
What are the colors of Felsite?
Felsite is a field term for a light-colored rock that typically requires petrographic examination or chemical analysis for more precise definition. Color is generally white through light gray, or red to tan and may include any color except dark gray, green or black (the colors of trap rock).
What is the difference between mafic and felsic?
Either in describing rocks or lava, mafic means that the lava or rock has less silica while felsic implies that the lava or rock has the most silica. 6. Mafic rocks are darker in color than felsic rocks.
Is Felsite an igneous rock?
Felsite definition A fine-grained, light-colored igneous rock, composed chiefly of feldspar and quartz.
What is the difference between the formation and characteristics of intrusive igneous rock and extrusive igneous rock?
The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.
Is rainbow obsidian natural?
Yes, Rainbow Obsidian is natural. This is a piece of the Jalisco Mexico variety that I cut. The material is well known for the rainbow sheen.
What is peanut obsidian?
Peanut Obsidian is a variety of Perlite and a naturally occurring amorphous volcanic glass with high water content. The red spheres which make this crystal so unique are actually feldspar crystals. These have been stained red over time by a coating of Hematite.
Which factor is responsible for the difference between extrusive and intrusive rocks?
Answer: The place where the cooling of magma takes place is responsible for the difference between extrusive and intrusive rocks.
What are the characteristics of intrusive igneous rocks?
Intrusive rocks are characterized by large crystal sizes, i.e., their visual appearance shows individual crystals interlocked together to form the rock mass. The cooling of magma deep in the Earth is typically much slower than the cooling process at the surface, so larger crystals can grow.