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scoria

scoria

SRI Petrography ID: 34

Names

[de] Schlacke
[en] scoria

Description

scoria is a porous, heavy, dark coloured glassy volcanic rock. Scoria mostly has basaltic or andesitic chemical composition, formed either by explosive eruptions (e.g. Hawaii) or as dark, cellular crust on some lavas.
On the other hand scoria is a blast-furnace slag or scum.

Color

dark coloured

Grain Size

fine grained, glassy

Texture

porous volcanic glass

Minerals

glass

Occurences

Scoria can be found in volcanic areas throughout the world, e.g. Italy, Greek islands, Iceland

Comments

A finer-grained rock with more and smaller air spaces (pores) is called pumice.

Classification

Class

IGNEOUS ROCKS

Broader Terms

pyroclastic rocks