Volcanic fragments the size of dust particles.

Sand-sized or smaller volcanic fragments

Fine, 4.0 mm (.16 in) to 0.25mm (.01 in) in diameter, unconsolidated pyroclastic (ejected particles) material.

Sand sized or finer-grained volcanic ejecta. Coarser material is called lapilli (qv).

Fine fragments (less than 2 millimeters across) of lava or rock formed in an explosive volcanic eruption.

Fragments of lava or rock smaller than 2 mm (fraction of an inch) in diameter that are blasted into the air by volcanic explosions.

See Volcanic Ash

very small, fine fragments of lava or rock that are blasted into the air during volcanic explosions.

This is defined as volcanic particles less than 4 mm in diameter.

Volcanic ash consists of tiny jagged particles of rock and natural glass blasted into the air by a volcano. Ash may be solid or molten when first erupted.

Fine particles of pulverized rock blown from an explosion vent. Measuring less than 1/10 inch in diameter, ash may be either solid or molten when first erupted. By far the most common variety is vitric ash (glassy particles formed by gas bubbles bursting through liquid magma).

Fine particles of volcanic rock and glass blown into the atmosphere by a volcanic eruption. more details...

Fragments less than 2 millimeters in diameter of lava or rock blasted into the air by volcanic explosions.

Any rock particle or crystals thrown out by volcanoes that are less than 2mm in size.

Solid or Molten particles from the rocks that were pulverized during a volcanic explosion.

1. Airborne particulates produced as a combustion product. These affect air quality, and their emission and ambient concentration is often regulated. For example, coal ash can consist of oxides of silicon, aluminum, iron, calcium, magnesium, sodium, potassium, sulfur, and titanium. 2. Airborne particulates produced by a volcano. These are often fine particles of rock with very sharp edges, which cause great abrasion and wear when ingested in the air intake of an engine, and can quickly lead to engine failure.

fine pyroclastic fragments equal to or less than 4 millimeters in diameter. During volcanic eruptions, these very fine fragments render the eruption columns a characteristic deep brown to lead gray color.

The fine-grained material produced by a pyroclastic eruption. An ash particle is defined to have a diameter of less than 2 millimeters.

Small particles of solid material blasted out of a volcano when it erupts.

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