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  1. Feldspar - Mineralogy, Crystallography, Structure | Britannica

  2. Feldspar - Wikipedia

  3. Search - 6.4.3: Feldspars - Geosciences LibreTexts

  4. Feldspar Minerals: Crystal Structure and Physical Properties 1 ...

  5. Feldspar | Properties, Uses, Types, & Facts | Britannica

  6. ALEX STREKEISEN-Feldspar structure-

  7. Gallery of Feldspars - ThoughtCo

  8. Feldspar minerals make up over 50% of Earth's crust. - Geology.com