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  • SiO4 Tetrahedron
  • Isolated Single Tetrahedra
  • Single Chain Tetrahedra
  • Double Chain Tetrahedra
  • Sheet-Like Tetrahedra
  • Framework Tetrahedra
  • Diagnostic Properties
  • Type of Twinning
  • Alkali Feldspars
  • Plagioclase Feldspars
  • Comprises one silicon ion joined to four oxygen atoms
  • Typical of the structure of olivine where none of the oxygen ions are shared with adjacent tetrahedra, Iron and Magnesium ions take up the free bonds
  • Typical of the structure of hornblende where adjacent tetrahedra share one oxygen ion
  • Typical of the structure of augite where adjacent tetrahedra share two oxygen ions
  • Typical of the structure of Micas where adjacent tetrahedra share three oxygen ions
  • Typical of the structure of Quartz where tetrahedra have all four oxygen ions shared by adjacent tetrahedra
  • Two or three physical properties that enable any mineral to be identified
  • Most reliable physical property to distinguish Orthoclase Feldspar from Plagioclase Feldspar
  • Types of feldspar that contain Sodium (Na) and Potassium (K)
  • Types of feldspar that contain Sodium (Na) and Calcium (Ca)