EARTH SCIENCE LAB
Volcanic Materials Sample #10

Identify the Pyroclastic Material

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

                

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