Vitrophyre

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Glassy volcanic rock

title: "Vitrophyre" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["volcanic-rocks"] description: "Glassy volcanic rock" topic_path: "general/volcanic-rocks" source: "https://en.wikipedia.org/wiki/Vitrophyre" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Glassy volcanic rock ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/66/Rhyolitic_vitrophyre.jpg" caption="rhyolitic]] vitrophyre; large phenocrysts are set in the black glassy matrix"] ::

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. Vitrophyres can be alternatively described as rocks having vitrophyric texture. This texture results from the rapid quenching of a lava where phenocrysts had started to form prior to eruption.

References

References

  1. Best, Myron G.. (2002). "Igneous and Metamorphic Petrology". Blackwell Publishing.
  2. Winter, John D.. (2014). "Principles of Igneous and Metamorphic Petrology". Pearson.
  3. (2009). "Principles of Igneous and Metamorphic Petrology". Cambridge University Press.

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