Discussion
A texture consisting of large crystal of quartz with mosaic substructure surrounded by a fine-grained aggregate of quartz, are termed as .................. texture.
Answer: A
This is a mortar texture.
In mortar texture large relict grains (porphyroclasts), commonly quartz or feldspar showing internal subgrains, are surrounded by a fine-grained aggregate of recrystallised grains of the same mineral, like stones set in mortar. It forms when deformation recrystallises the edges of grains in shear zones, as in mylonites.
Diaphoresis (diaphthoresis) is retrograde metamorphism, not a texture, and phyllonite is a rock (a mylonitised rock with a phyllitic sheen). Reaction rims are coronas of new minerals formed by reaction around a grain, not a fine aggregate of the same mineral.
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