Lyapounov exponents have been determined for patterns of oscillatory zoning as revealed by cathodoluminescence in zircon and apatite; values for the exponent range from +0.0011 to +0.0149. These positive values indicate that the zoning patterns are weakly chaotic, and that the development of the zoning was sensitive to the initial conditions of crystal growth. The Lyapounov exponent can be used as a quantitative measure of the zoning character and in comparisons of various patterns of zoning.

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