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A neutron diffraction analysis was performed on a single crystal of natural natrolite, Na 2 Al 2 Si 3 O 10  · 2H 2 O, orthorhombic,  Fdd 2,  a  = 18.326(5) Å,  b  = 18.652(5) Å,  c  = 6.601(3) Å,  Z  = 8. Refinement of 235 independent reflections yielded  R  = 0.028. The Al – O and Si – O bond distances are determined with a precision of 0.005 Å. The O – H bonds range from 0.9125 to 0.9130 Å. The mean angle O – H … O is 156.9°.

A neutron diffraction refinement of the crystal structure of natural natrolite, Na 2 Al 2 Si 3 O 10 · 2H 2 O