Figure 6.

(a) Normalized frequency histogram for the Ca—O distances that are present in the crystal structures of 35 crystalline calcium silicate hydrates and related phases. (b) Histogram that shows the percentage of the Ca atoms in these phases that are coordinated to different numbers of O atoms. The data include: 11 Å tobermorite (anomalous; MDO₂ polytype; Merlino et al., 1999 ▸, 2000 ▸); 11 Å tobermorite (normal; MDO₂ polytype; Merlino et al., 2001 ▸); 14 Å tobermorite (MDO₂ polytype; Bonaccorsi et al., 2005 ▸); 9 Å clinotobermorite (MDO₂ polytype; Merlino et al., 1999 ▸, 2000 ▸); afwillite (Malik & Jeffery, 1976 ▸); bultfonteinite (McIver, 1963 ▸; Biagioni et al., 2010 ▸); calcium chondrodite (Kuznetsova et al., 1980 ▸); chegemite (Galuskin et al., 2009 ▸); clinotobermorite (MDO₂ polytype; Merlino et al., 1999 ▸, 2000 ▸); cuspidine (Saburi et al., 1977 ▸); dellaite (Safronov et al., 1981 ▸); fedorite (Mitchell & Burns, 2001 ▸); foshagite (Gard & Taylor, 1960 ▸); fukalite (Merlino et al., 2009 ▸); gyrolite (Merlino, 1988 ▸); hillebrandite (Dai & Post, 1995 ▸); jaffeite (Yamnova et al., 1993 ▸); jennite (Bonaccorsi et al., 2004 ▸); K-phase (Gard et al., 1981 ▸); kilchoanite (Taylor, 1971 ▸); killalaite (Taylor, 1977 ▸); nekoite (Alberti & Galli, 1980 ▸); okenite (Merlino, 1983 ▸); pectolite (Takéuchi & Kudoh, 1977 ▸); poldervaartite (Dai et al., 1993 ▸); reyerite (Merlino, 1988 ▸); rosenhahnite (Wan et al., 1977 ▸); rustumite (Howie & Ilyukhin, 1977 ▸); scawtite (Zhang et al., 1992 ▸; cell parameter a given in the paper as 10.0394 is a mistake and has been corrected to 11.0394 Å); suolunite (Ma et al., 1999 ▸); tilleyite (Grice, 2005 ▸); wollastonite 1 A (Ohashi, 1984 ▸); xonotlite (Hejny & Armbruster, 2001 ▸; polytype derived from a structure in Kudoh & Takeuchi, 1979 ▸); Z-phase (Garbev, 2003 ▸; model structure); α-C₂SH (Marsh, 1994 ▸).