The apparent solubility of albite in pure water is determined over a limited range of temperatures at a pressure of 300 bars and compared with that of quartz. The solubilities are of the same order of magnitude suggesting that they both disintegrate or decompose according to the same mechanism. The greater “solubility” of quartz accounts for its first appearance and great persistence in natural hydrothermal solutions.

Both ions and silicate fragments result when albite is attacked under the experimental conditions used. The possibility that actual particles of silicate structures, ranging up to 1000 unit cells in size, might be transported through rocks is suggested.

An origin of certain clay minerals and the alumino-silicate fragments in shales is discussed.

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