Felsite is a very fine-grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light-colored rock that typically requires petrographic examination or chemical analysis for more precise definition.

As a rock term initially used for the microcrystalline groundmass of porphyries but now more commonly used for microcrystalline rocks of granitic composition. The name had previously been used by Kirwan (1794) for a microcrystalline variety of feldspar. Synonym of: felstone, aphanite. Please feel free to link to this page.

Felsite is a general term for a type of igneous rock that is characterized by its fine-grained or glassy texture. It typically has a lower silica content than other types of igneous rocks. It’s chemical composition is typically similar to that of granite. Felsite usually forms from the slow cooling of magma near the earth’s surface.

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).

The term "felsite" is a catch-all category for a wide range of typically light-colored, fine-to-coarse grained volcanic rock that is ubiquitous across the Big Bend and eastern Trans-Pecos. All things considered, felsite was probably the most commonly used toolstone through time of prehistoric peoples in the region.

Felsite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks. What is Felsite? In this section, we will learn more about properties of Felsite i.e. physical and thermal properties.

Felsite is a very fine-grained volcanic rock that may or may not contain larger crystals. It typically consists of a fine-grained matrix of felsic materials, particularly quartz, sodium and potassium feldspar, and may be used in making stone tools.

Felsite (also called felstone) is a very fine grained volcanic rock that may or may not contain larger crystals. Felsite is a field term for a light colored rock that typically requires petrographic examination or chemical analysis for more precise definition.

In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic; those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic; and those with less than 45 percent are ultramafic.

Dec 10, 2023 · What is felsite? Felsite is a field term that refers to any aphanitic or very fine-grained rock yet to be identified and classified after a chemical or microscopic analysis.