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This sample is a felsic igneous rock. You can tell it is a volcanic rock because of the presen of glass and the porphyritic texture. The glass in this rock forms the matrix around the minerals and is isotropic. This rock contains plagioclase feldspar, quartz, sanidine, and a common mafic phase. Sanidine is an alkali feldspar which typically forms euhedral, blocky crystals with two cleavage planes and low interference colors (similar to plagioclase). It also has distinctive Carlsbad twinning (simple twins that divide a grain into two domains). A. Sanidine and all alkali feldspars are biaxial (-). How would you distinguish these

This sample is a felsic igneous rock. You can tell it is a volcanic rock because of the presen of glass and the porphyritic texture. The glass in this rock forms the matrix around the minerals and is isotropic. This rock contains plagioclase feldspar, quartz, sanidine, and a common mafic phase. Sanidine is an alkali feldspar which typically forms euhedral, blocky crystals with two cleavage planes and low interference colors (similar to plagioclase). It also has distinctive Carlsbad twinning (simple twins that divide a grain into two domains). A. Sanidine and all alkali feldspars are biaxial (-). How would you distinguish these

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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This sample is a felsic igneous rock. You can tell it is a volcanic rock because of the presence of glass and the porphyritic texture. The glass in this rock forms the matrix around the minerals and is isotropic. This rock contains plagioclase feldspar, quartz, sanidine, and a common mafic phase. Sanidine is an alkali feldspar which typically forms euhedral, blocky crystals with two cleavage planes and low interference colors (similar to plagioclase). It also has distinctive Carlsbad twinning (simple twins that divide a grain into two domains). A. Sanidine and all alkali feldspars are biaxial (-). How would you distinguish these minerals from each other in thin section?
Transcribed Image Text:This sample is a felsic igneous rock. You can tell it is a volcanic rock because of the presence of glass and the porphyritic texture. The glass in this rock forms the matrix around the minerals and is isotropic. This rock contains plagioclase feldspar, quartz, sanidine, and a common mafic phase. Sanidine is an alkali feldspar which typically forms euhedral, blocky crystals with two cleavage planes and low interference colors (similar to plagioclase). It also has distinctive Carlsbad twinning (simple twins that divide a grain into two domains). A. Sanidine and all alkali feldspars are biaxial (-). How would you distinguish these minerals from each other in thin section?
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