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fine-grained crystalline rocks

fine-grained crystalline rocks

SRI Petrography ID: 8

Names

[de] Feinkörnige Kristallingesteine
[en] fine-grained crystalline rocks

Description

A fine-grained, igneous rock is composed of macroscopically often not visible silicatic minerals. Fine-grained magmatites normally belong to the group of the extrusive magmatites (vulcanites), their chemical composition is variable, depending on the magmatic source rock type.

The most important rock types belonging to this group are:
basalt
andesite
felsite
rhyolite

Color

variable

Grain Size

Fine (to medium) grained

Texture

variable, no grain orientation

Minerals

variable

Occurences

all over the world

Classification

Class

IGNEOUS ROCKS

Narrower Terms

andesite

basalt

felsite

rhyolite