Analcime (NaAlSi₂O₆cdotH₂O, S6₁)

Unit cell

Lattice constants

a = 13.723 Å, b = 13.723 Å, c = 13.686 Å; α = 90.00°, β = 90.00°, γ = 90.00°

Cell volume

2577.4 ų

Atoms in the conventional cell

184 (Na 24, Al 16, H 16, O 96, Si 32)

Formula units Z

8

Pearson symbol

tI184 — tetragonal, body-centred lattice, 184 atoms per conventional cell

Symmetry operations

32 per cell

Crystallographic sites

The multiplicity and the Wyckoff letter say how many copies of the site the group makes in one cell and on which kind of symmetry element the site sits; the 184 atoms drawn above are these sites multiplied by all 32 operations. Press Wyckoff under Colour to see the sites, and tick a symmetry element on the left to see which atoms lie on it.

How to read the label

A2B2C3D12E4_tI184_142_f_f_be_3g_g-001: the stoichiometry comes first (A, B, C… are the elements in alphabetical order of their site labels), then the Pearson symbol tI184, then the space-group number 142, then the Wyckoff letters occupied by each element in turn (Na: 8b; Na: 16e; Al: 16f; H: 16f; O: 32g; O: 32g; O: 32g; Si: 32g). Two structures with the same label are the same arrangement with different cell parameters or coordinates.

Note: S6₁, Analcime.

Source

Coordinates and cell from the AFLOW Encyclopedia of Crystallographic Prototypes, entry A2B2C3D12E4_tI184_142_f_f_be_3g_g-001 (M. J. Mehl et al., Comput. Mater. Sci. 136, S1 (2017); D. Hicks et al., ibid. 161, S1 (2019) and 199, 110450 (2021); S. Eckert et al., ibid. 240, 112988 (2024)). Symmetry elements, Wyckoff assignment and the diagram are computed on this page from the group operations.