Volcanic ash
A rock classification type
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About Volcanic ash
A tephra where at least 75% of the fragments are ash grade (less than 2mm.)
Fine pyroclastic material (under 2.0 mm diameter; under 0.063 mm diameter for fine ash), expelled from volcanoes The term usually refers to the unconsolidated material but sometimes is also used for its consolidated counterpart, tuff.
Synonym of: ash, volcanic dust, pumicite
Not to be confused with fine residual solid products from combustion of organic matter: ash (general)
Fine pyroclastic material (under 2.0 mm diameter; under 0.063 mm diameter for fine ash), expelled from volcanoes The term usually refers to the unconsolidated material but sometimes is also used for its consolidated counterpart, tuff.
Synonym of: ash, volcanic dust, pumicite
Not to be confused with fine residual solid products from combustion of organic matter: ash (general)
Unique Identifiers
Mindat ID:
48610
Long-form identifier:
mindat:1:1:48610:9
Classification of Volcanic ash
Sub-divisions of Volcanic ash
Synonyms of Volcanic ash
Internet Links for Volcanic ash
mindat.org URL:
https://www.mindat.org/min-48610.html
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Please feel free to link to this page.
Mount Ruapehu, Ruapehu District, Manawatu-Whanganui Region, New Zealand