Abstract
The magnetic susceptibility and anisotropy of natural muscovite and synthetic fluorphlogopite have been measured. These minerals contain small quantities of iron which cause paramagnetic and ferromagnetic effects. To a fair approximation the mean susceptibility is found to vary linearly with the total iron content, and the paramagnetic anisotropy to be proportional to the ferrous iron content At low field strengths ferromagnetic impurities (probably sub-microscopic inclusions of magnetite) cause anomalous results It is shown that such inclusions are present in all the micas examined, and account for the apparent paramagnetism of synthetic mica. The inclusions are probably orientated with their magnetic axes in a preferred direction relative to the crystallographic axes of the mica.
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