Hyaloclastite is a hydrated tuff-like brecciarich in black volcanic glass, formed during volcanic eruptions under water, under ice or where subaerial flows reach the sea or other bodies of water. It has the appearance of angular flat fragments sized between a millimeter to few centimeters. The fragmentation occurs by the force of the volcanic explosion, or by thermal shock during rapid cooling.
Hyaloclastite is a hydrated tuff-like brecciarich in black...
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