Magnesium silicate hydrate *

H₂Mg_2.58O_11.58Si₄

Longchambon, H

Bulletin de la Societe Francaise de Mineralogie (-71,1948) (1937) 60, 232-276

a=20.2Å   b=14.9Å   c=5.3Å

α=90°   β=90°   γ=90°