ES2 Metamorphic Rocks - Metamorphic Microstructures #1
Granoblastic texture
is the typical texture formed in metamorphic rocks when grains mutually adjust their boundaries in the solid state in an attempt to achieve textural equilibrium. The minerals do not show a strong tendency to develop their characteristic crystal shape, but are equant, with fairly uniform grain size and straight or smoothly-curved boundaries. The minerals in this pyroxene-hornfels facies rock are plagioclase, orthopyroxene, clinopyroxene and ilmenite.

Field of view is 1.5 mm across.

Metabasic hornfels, Sample 507

First image, ppl
Second image, xpol
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DJW - August 1997