AM_Hillebrandite Formula: Ca3 Si1.5 O7.5 H2 Name: Hillebrandite Unit cell: 3.6389 16.311 11.829 90.0 90.0 90.0 , V=702.10 Space group: CMC21 (36)

Dai Y S , Post J E , American Mineralogist , 80 (1995) p.841-844, Crystal structure of hillebrandite: A natural analogue of calcium silicate, hydrate (CSH) phases in Portland cement