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The substructure of natural clinotobermorite Ca 5 [Si 3 O 8 (OH)] 2  · 4 H 2 O \p=n-\ Ca 5 [Si 6 O l7 ] · 5 H 2 O from the Wessels mine, Kalahari manganese field, South Africa, was determined from single-crystal X-ray data. The diffraction pattern (monoclinic:  a  = 11.19 Å,  b  = 7.29 Å,  c  = 22.46 Å,  β  = 96.97°) is characterised by rather diffuse reflections of the type  hkl  with  h ,  k  = 2 n  + 1. The substructure (space group  I 2/ m ,  Z  = 1,  a /2 = 5.593(6) Å,  b /2 = 3.645(4) Å,  c  = 22.46(3) Å,  β  = 96.97(2)°) was solved from the sharp Bragg reflections ( hkl , with  h ,  k  = 2 n ) and refined on the basis of 1877 unique reflections to  R ( F ) = 6.7%.

zeitschrift für kristallographie - crystalline materials

Clinotobermorite, Ca 5 [Si 3 O 8 (OH)] 2  · 4 H 2 O \p=n-\ Ca 5 [Si 6 O 17 ] · 5 H 2 O, a natural C\p=n-\S\p=n-\H(I) type cement mineral: determination of the substructure