CratonLab

CratonLab / Textures / Poikiloblastic

Metamorphic texture

Poikiloblastic texture

Porphyroblasts containing small inclusions of other minerals.

What it means

Inclusion trails compared with the matrix fabric help show whether a crystal grew before, during or after deformation; curved trails can record rotation.

Where to look for it

Garnet ('snowball' garnets), staurolite

Photo examples

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All textures in the toolkit

Sources

Wikipedia: Porphyroblast