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Scoria
Scoria cones are a form of lava or a fragmental ejecta. (lapilli, blocks and bombs)
This rock is mostly a dark color like dark brown, black or red
After eruptions, volcanic cones of scoria can be left behind
The specific gravity is greater than 1, and will sink in water
Scoria comes from the Greek slag, skria, rust.
Cinder is an old name for Scoria
This rock sinks in water because of a special gravity
This rock is the lightest one on Earth, gravity less than 0.3
Scoris is a term for macrovesicular volcanic rock.
