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Feldspar - Mineralogy, Crystallography, Structure | Britannica
Feldspar - Wikipedia
Search - 6.4.3: Feldspars - Geosciences LibreTexts
Feldspar Minerals: Crystal Structure and Physical Properties 1 ...
Feldspar | Properties, Uses, Types, & Facts | Britannica
ALEX STREKEISEN-Feldspar structure-
Gallery of Feldspars - ThoughtCo
Feldspar minerals make up over 50% of Earth's crust. - Geology.com