B. How would you distinguish quartz from alkali feldspar in thin section? Please list at least two properties for each mineral type that can be used to differentiate quartz and potassium feldspar.
B. How would you distinguish quartz from alkali feldspar in thin section? Please list at least two properties for each mineral type that can be used to differentiate quartz and potassium feldspar.
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
Related questions
Question
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)
Transcribed Image Text:B. How would you distinguish quartz from alkali feldspar in thin section? Please list at least
two properties for each mineral type that can be used to differentiate quartz and
potassium feldspar.
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