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felsite

felsite

SRI Petrography ID: 24

Names

[de] Felsit
[en] felsite

Description

Felsite is a fine-grained, volcanic rock of light colour and is composed mainly of feldspar and quartz. It may also contain phenocrysts (>>>porphyry).
Felsite is typically of volcanic origin and is often found in association with acidic rocks as obsidian or rhyolite

Color

white to light gray, sometimes red and other colours

Grain Size

fine grained matrix

Texture

felsic or porphyric (if containing phenocrysts)

Minerals

quartz and feldspar

Comments

Felsite has in some cases been used for making stone tools

Classification

Class

IGNEOUS ROCKS

Broader Terms

fine-grained crystalline rocks