Cinder

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Cinders are fragments of cooled pyroclastic material lava, typically red or black in color.

The following geologic characteristics define a cinder:

Uncemented.
Vitric.
Bubble-like cavities, called vesicles.
Fragments are more than 2.0 mm in at least one dimension.
Apparent specific gravity between 1.0 and 2.0 mm.

Cinder

See also: Cinder, Geology, Lava, Specific gravity, Vesicle (geology), Vitric