Extinction angles of synthetic intermediate albites measured on a universal stage are extrapolated to low albite and analbite. The extinction angle on (010) plates, X' Л trace (001), decreases linearly with 2θ(131)−2θ(131) and hence with structural state from 19.9° for maximum low albite to 7.7° for analbite. The extinction angle on (001) plates, X' Л trace (010), increases from 2.8° for low albite to 8.1° for analbite.

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