Differential thermal analysis was used to determine the vermiculite component of biotitic vermiculite by G. F. Walker in 1951. This was accomplished by measuring the area associated with the endotherms below 350°C and then comparing this area to that of a high purity vermiculite. Essentially identical thermograms were obtained by Walker from a biotitic vermiculite (or hydrobiotite: Gruner, 1934) sample and from a mixture of vermiculite with a suitable amount of inert material.

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