The hypothesis suggested by Shelley (1973) for the origin of a quartz-plagioclase symplectite in the Haast Schists, which are poor in K-feldspar, contrasts markedly with that initially proposed by Shelley (1964) for the genesis of myrmekite. If it is accepted that the intergrowth comes within the term myrmekite, then Shelley (1973) has presented further evidence that myrmekite is polygenetic.

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