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Alkaline Feldspar subgroup, Alkali Feldspar subgroup
[ A ][Al X Si
2
O
8
]
[ K
+
][ Si
4+
]:
Adularia
[ K
+
][ Si
4+
]:
Microcline
[ K
+
][ Si
4+
]:
Orthoclase
[ K
+
][ Si
4+
]:
Sanidine
[ Rb
+
][ Si
4+
]: Rubicline
[ (Na,K)
+
][ Si
4+
]:
Anorthoclase
[ (K,Ba) ][ (Si,Al) ]:
Hyalophane
[ Ba
2+
][ Al
3+
]:
Celsian
[ K
+
][ Al
3+
][ As
3+
]: Filatovite
K => (Na,Ca):
Plagioclase series
Class:
Feldspar group
Class:
Tecto-Aluminosilicate
System: Triclinic or Monoclinic