Vitrophyre

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]