EARTH SCIENCE LAB
Volcanic Materials Sample #4

Identify the Lava Flow Material

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

                

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