Scoria (pl. scoriae), also called volcanic cinder, is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. It is typically dark in color (brown, black, or purplish-red), and basaltic or andesitic in composition.
Scoria (pl. scoriae), also called volcanic cinder, is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. It is typically dark in color (brown, black, or purplish-red), and basaltic or andesitic in composition.
Source: Wikipedia "Scoria" · CC BY-SA 4.0
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