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A hypothetical ‘trimer’ derived from a staggered-chain clinotobermorite (a) viewed along the a axis (edge lengths b and csin β = 42.702 Å), and (b) viewed along the b axis (edge lengths a and c). The formula is Ca11(Si9O28(OH)2)(H2O)8.5; the calculated density is 2.494 g cm−3; i = 2 × SOFBT = 0.5. The space group is C1; a = 11.35, b = 7.3, c = 42.9 Å, α = 90, β = 95.5, γ = 90°; Z = 4; full details are in the CIF datablock T3_14sc.
