Looking for reliable reference of ettringite structure: Ca6Al2(SO4)3(OH)12 x 
26(or 32?)H2O. Is reference cited in PDF #41-1451 of Moore and Taylor, Acta 
Cryst. 26B, 386 (1970) still relevant? -- ettringite is believed to be the 
culprit in sulfate attack on your conrete foundation when the latter is 
poured in high sulfate soil using regular portland cement (type I or II).

L. Keller 

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