Vitrophyric

Vitrophyre

Vitrophyre

Glassy volcanic rock

A vitrophyre is a porphyritic volcanic rock in which phenocrysts are embedded in a glassy matrix. Vitrophyres are contrasted from typical porphyritic rocks in that the latter has both crystalline phenocrysts (larger grains) and a crystalline matrix (smaller grains), whereas the former has a distinctly glassy matrix.[1] Vitrophyres can be alternatively described as rocks having vitrophyric texture.[2] This texture results from the rapid quenching of a lava where phenocrysts had started to form prior to eruption.[3]

Example of a rhyolitic vitrophyre; large phenocrysts are set in the black glassy matrix


See also

References

  1. [1]
    Best, Myron G. (2002). Igneous and Metamorphic Petrology. Blackwell Publishing. p. 27. ISBN 9781405105880.
  2. [2]
    Winter, John D. (2014). Principles of Igneous and Metamorphic Petrology. Pearson. p. 40. ISBN 9781292021539.
  3. [3]
    Philpotts, Anthony; Ague, Jay (2009). Principles of Igneous and Metamorphic Petrology. Cambridge University Press. p. 198. ISBN 9780521880060.
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