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Custer Feldspar es un feldespato potásico, se extrae en Dakota del Sur.


Análisis químico Editar

  • SiO2...... 68.50
  • Al203.....17.00
  • Fe2O3...00.15
  • CaO ......00.30
  • MgO .....Trace
  • Na2O ....03.00
  • K20 .......10.00
  • L.O.I........00.30


Sustitución Editar

For: 1.00 Custer feldspar Sub:

  • 0.76 Nepheline syenite (24)
  • 0.24 Silica

For: 1.00 Custer feldspar Sub:

  • 0.68 Nepheline syenite (25)
  • 0.24 Silica

For: 1.00 Custer feldspar Sub:

  • 0.72 Nepheline syenite (26)
  • 0.24 Silica