Felsite

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Felsite

Felsite is a very fine grained volcanic rock

Volcanic rock

Volcanic rock is an igneous rock of Volcano origin.Texture Volcanic rocks are usually fine-grained or aphanitic to glassy in texture....
that may or may not contain larger crystal

Crystal

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Felsite is a very fine grained volcanic rock

Volcanic rock

Volcanic rock is an igneous rock of Volcano origin.Texture Volcanic rocks are usually fine-grained or aphanitic to glassy in texture....
that may or may not contain larger crystal

Crystal

A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions....
s. 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 traprock). The mass of the rock consists of a fine-grained matrix

Matrix (geology)

The matrix or groundmass of rock is the fine-grained mass of material in which larger grains or crystals are embedded.The matrix of an igneous rock consists of fine-grained, often microscopic, crystals in which larger crystals are embedded....
of felsic

Felsic

Felsic is a term used in geology to refer to silicate minerals, magma, and rock which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium....
materials, particularly quartz

Quartz

Quartz is the most abundant mineral in the Earth's continental crust . It is made up of a Crystal structure of silica tetrahedra. Quartz has a hardness of 7 on the Mohs scale and a density of 2.65 g/cm?....
, sodium

Plagioclase

Plagioclase is a very important series of Silicate minerals minerals within the feldspar family. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a solid solution series, more properly known as the plagioclase feldspar series ....
and potassium feldspar, and may be termed a quartz felsite or quartz porphyry if the quartz phenocrysts are present. This rock is typically of volcanic origin, and may be found in association with obsidian

Obsidian

Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools without crystal growth....
and rhyolite

Rhyolite

This page is about a volcanic rock. For the ghost town see Rhyolite, Nevada, and for the satellite system, see Rhyolite/Aquacade.Rhyolite is an igneous rock, volcanic rock , of felsic composition ....
. In some cases, it is sufficiently fine-grained for use in making stone tool

Stone tool

A stone tool is, in the most cave general sense, any tool made of Rock . Although stone-tool-dependent cultures exist even today, most stone tools are associated with prehistoric societies that no longer exist....
s.