Vitrophyre

Vitrophyre is a volcanic rock with a porphyritic texture in which larger crystals (phenocrysts) are embedded in a glassy groundmass. 

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Vitrophyric Texture

Source alexstrekeisen.it

This is variety of inequigranular porphyritic texture in which larger crystals known as phenocrysts are embedded in a glassy ground mass.

Bibliography

• Cox et al. (1979): The Interpretation of Igneous Rocks, George Allen and Unwin, London.
• Howie, R. A., Zussman, J., & Deer, W. (1992). An introduction to the rock-forming minerals (p. 696). Longman.
• Le Maitre, R. W., Streckeisen, A., Zanettin, B., Le Bas, M. J., Bonin, B., Bateman, P., & Lameyre, J. (2002). Igneous rocks. A classification and glossary of terms, 2. Cambridge University Press.
• Middlemost, E. A. (1986). Magmas and magmatic rocks: an introduction to igneous petrology.
• Shelley, D. (1993). Igneous and metamorphic rocks under the microscope: classification, textures, microstructures and mineral preferred-orientations.
• Vernon, R. H. & Clarke, G. L. (2008): Principles of Metamorphic Petrology. Cambridge University Press.

Photo

Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)
Vitrophyric Texture in an Andesite. XPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite. XPL image, 2x (Field of view = 7mm)
Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)
Vitrophyric Texture in an Andesite (Plagioclase and magnetite crystals). PPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite. XPL image, 2x (Field of view = 7mm)	Vitrophyric Texture in an Andesite (Plagioclase and Pyroxene crystals). PPL image, 10x (Field of view = 2mm)
Phenocrysts embedded in a glassy ground mass. PPL image, 2x (Field of view = 7mm)	Phenocrysts embedded in a glassy ground mass. PPL image, 2x (Field of view = 7mm)	Phenocrysts embedded in a glassy ground mass. PPL image, 2x (Field of view = 7mm)
Phenocrysts embedded in a glassy ground mass (with magmatic flow). PPL image, 2x (Field of view = 7mm)	Phenocrysts embedded in a glassy ground mass. XPL image, 2x (Field of view = 7mm)	Phenocrysts embedded in a glassy ground mass (with magmatic flow). PPL image, 2x (Field of view = 7mm)
Phenocrysts embedded in a glassy ground mass. XPL image, 2x (Field of view = 7mm)