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The crystal structure of astrophyllite K2Na(Fe, Mn, Mg, □)7[Ti2(Si4O12)2|O3](OH, F)4 has been refined. The dimensions of the triclinic unit cell are: a = 0.5359(2) nm, b = 1.1614(4) nm, c = 1.1861(4) nm, α= 113.16(2)°, γ= 103.04(2)°, γ = 94.56(2)°, V= 0.6495(5) nm3, Z= 1, space group P1, R=0.057 for 5308 reflections |F0|>3σ|F0|. According to structural and compositional differences the monoclinic astrophyllite K2NaNa(Fe, Mn)4Mg2Ti2[Si4O12]2(OH)4(OH, F)2 and astrophyllite should be considered as two different mineral species. Astrophyllite, monoclinic astrophyllite, bafertisite and lamprophyllite contain heteropolyhedral sheets which topologically are related with Si, O sheets of mica where one or several SiO4 tetrahedra are replaced by TiOn polyhedra. Therefore this heterophyllotitanosilicate series represents a kind of functional substitution in inorganic crystals.
The dimensions of the astrophyllite K2Na (Fe, Mn, Mg, □) 7 [Ti2 (Si4O12) 2O3] (OH, F) 4 has been refined. The dimensions of the triclinic unit cell are: a = 0.5359 (2) (4) nm, α = 113.16 (2) °, γ = 103.04 (2) °, γ = 94.56 (2) °, V = 0.6495 (5) nm3, F0 |> 3σ | F0 |. According to structural and compositional differences of the monoclinic astrophyllite K2NaNa (Fe, Mn) 4Mg2Ti2 [Si4O12] 2 (OH) 4 (OH, F) 2 and astrophyllite should be considered as two different mineral species. Astrophyllite, monoclinic astrophyllite, bafertisite and lamprophyllite containing heteropolyhedral sheets which topologically are related with Si, O sheets of mica where one or several SiO4 tetrahedra are replaced by TiOn polyhedra. heterophyllotitanosilicate series represents a kind of functional substitution in inorganic crystals.