Keywords: Streckeisen for volcanic quartz igneous rocks.svg en Streckeisen classification for volcanic igneous rocks Quartz field Used by IUGS fr Classification Streckeisen pour les roches magmatiques volcaniques champs des roches quartzeuses Normalisation de l'IUGS Own work Inkscape Sources An introduction to igneous and metamorphic petrology J D Winter Prentice Hall Éléments de géologie C Pomerol Y Lagabrielle M Renard Dunod 17 57 30 April 2007 UTC jd See also Image Streckeisen for volcanic foid igneous rocks svg Image Streckeisen for intrusive quartz igneous rocks svg Image Streckeisen for intrusive foid igneous rocks svg Image Gabbroic igneous rocks svg Image Ultramafic igneous rocks svg Image Qapf diagram plutonic 05 svg QAPF diagrams QAPF diagrams of volcanic rocks |