igneous
Red vesicular volcanic rock, likely scoria
Basaltic scoria; predominantly plagioclase, pyroxene, olivine, and volcanic glass
AI-generated identification · may be incorrectUsually dark red to black, highly vesicular, and dull to slightly glassy; hardness about 5–6, with no obvious cleavage and low-to-moderate density. The reddish color reflects oxidation of iron-bearing minerals during eruption.
Identified More igneous →
Explore Red vesicular volcanic rock, likely scoria in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Usually dark red to black, highly vesicular, and dull to slightly glassy; hardness about 5–6, with no obvious cleavage and low-to-moderate density. The reddish color reflects oxidation of iron-bearing minerals during eruption.
Formation & geological history
Forms when gas-rich basaltic lava froths and cools rapidly in a volcanic eruption, commonly during the Quaternary and other geologically young volcanic periods. Exact identification is limited by the photograph; it could also be oxidized vesicular basalt or cinder.
Uses & applications
Used as lightweight aggregate, landscaping stone, drainage material, and abrasive; attractive pieces may be collected as volcanic specimens. It is generally inexpensive.
Geological facts
Scoria is the volcanic equivalent of pumice but is denser and typically has larger, more connected vesicles. Its red color commonly develops in oxidizing conditions near lava flows or cinder cones.
Field identification & locations
Identify it by its rough, porous texture, iron-red/black color, and low weight; unlike pumice, it usually does not float. Common around basaltic volcanoes, cinder cones, and lava fields worldwide.
