ES2 Metamorphic Rocks - Metamorphic Microstructures #1
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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
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