EARTH SCIENCE LAB
Volcanic Materials Sample #9


Identify the Pyroclastic Material

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Volcanic Materials Identification Worksheet
Texture #1 Texture #2 Texture #3 Composition Tephra Size Rock Name Lava Flow Material Pyroclastic Material
Aphanitic Aphanitic Aphanitic Felsic < 2 mm Rhyolite Pahoehoe Agglutinate
Porphyritic Porphyritic Porphyritic Intermediate 2 - 64 mm Andesite Aa Ash
Glassy Glassy Glassy Mafic > 64 mm Basalt Aa Clinker Block
Vesicular Vesicular Vesicular Ultramafic NA   Block Bread-Crust Bomb
Pyroclastic Pyroclastic Pyroclastic       NA Cow-Pie Bomb
              Fusiform Bomb
              Irregular Bomb
              Lapilli
              Pumice
              Reticulite
              Ribbon Bomb
              Scoria
              Spherical Bomb
              NA

                

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