Abstract
Poorly crystalline talc-like material and highly crystalline 11 Å tobermorite occurred as small veins in a basic tuff. These are the first assemblages of this type to be recorded in nature. The 11 Å tobermorite was rich in Al and very poor in Mg, and it showed anomalous thermal behaviour similar to that of the Loch Eynort specimen. These results suggest that Mg cannot enter into the tobermorite structure but forms poorly crystallized hydrated magnesium silicates, when the hydrothermal treatment is carried out at low temperature from Mg-bearing raw materials such as Portland cement, high-magnesia cement, slag, etc.
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