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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