GEL 050L Igneous Rock Terms

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Last updated 8:50 PM on 4/27/26

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1

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Aphanitic

Non-visible crystals

2

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Phaneritic

Visible but smaller than 10mm

3

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Porphyritic

Large crystals in matrix of fine crystals

4

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Pegmatitic

Larger than 3cm

5

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Vesicular

Lots of holes/pockets

6

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Pyroclastic

Volcanic ash and fragments

7

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