Quelle information nous donne la texture vitreuse?

Quelle information nous donne la texture vitreuse?

Quelques minéraux peuvent apparaître dans la matrice mais généralement tout est noir. Cette texture est liée à une cristallisation très rapide. Si aucun minéraux sont visibles, on parle de texture vitreuse aphanitique. Si quelques minéraux présents sont de plus grosse taille, on parle de texture vitreuse porphyrique.

Pourquoi une roche est grenue?

Ainsi en résumé, la vitesse de refroidissement du magma va conditionner la texture de la roche. La texture micro grenue: C’est une texture intermédiaire entre la texture grenue et microlithique. Ce sont principalement des roches de semi profondeur qui peuvent cristalliser dans des sills ou des dykes.

What is the difference between Rhyolite and granite?

1 Answer. The difference is the size of grains. Rhyolite is the felsic igneous rock with fine-grained size. Whereas, granite is the equivalent in composition but with coarse-grained size.

What can rhyolite be used for?

In the road construction industry, rhyolite is often used as an aggregate to asphalt; however, for its high silica content, it is rarely used as a concrete aggregate. For its characteristics, rhyolite was used by Native American Indians to make tools, including scrapers, blades, and hammer stones, among others.

Is rhyolite considered extrusive or intrusive?

Both rhyolite and basalt are types of igneous rocks. Igneous rocks are usually found in two forms as intrusive and extrusive igneous rocks, based on the method of formation. Basalt is an extrusive igneous rock type. Rhyolite is considered as an extrusive volcanic rock that is equivalent to granite.

What does the name rhyolite mean?

Rhyolite is the extrusive equivalent of granite . It is a light-colored, fine-grained volcanic rock that forms from explosive eruptions of a highly viscous lava.