symplectite

symplectite

[sim′plek‚tīt]
(mineralogy)
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Instead, he suggested that either a symplectite growth model (Spry, 1969) or a dislocation growth model (Frank, 1951), or a combination of both, operated.
If the sum of volumes of both newly crystallized minerals in the symplectite (hercynite + quartz) was equal to the volume of the host mineral (kyanite), the resulting symplectite would copy the form of kyanite porphyroblasts; it would be a simple columnar pseudomorph.
Hercynite grains of the symplectite, mostly hundredths of mm in site, are isometric and almost xenoblastic.
Alteration of orthopyroxene into biotite-quartz symplectites indicates that the primary cooling after the peak-metamorphic stage has also occurred under similar conditions.