Particle surfaces are often coated with aggregates of zeolite crystals or clay and only relict textures remain to identify pyroclast types.
2.
Stresses within the " quenched " magma cause fragmentation into five dominant pyroclast shape-types : ( 1 ) blocky and equant; ( 2 ) vesicular and irregular with smooth surfaces; ( 3 ) moss-like and convoluted; ( 4 ) spherical or drop-like; and ( 5 ) plate-like.
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