Migmatite

Rock group Metamorphic and igneous
Metamorphism type Regional
Protolith Gneiss

Migmatite in Hand Sample

Migmatite from Unionville, VA
San Carlos migmatite
Migmatite exposed at Sea Point, South Africa

It’s a small outcrop, not a hand sample, but here’s some migmatite exposed on section A of the Billy Goat Trail at Great Falls National Park

Migmatite in Thin Section

Migmatite, plane polars
Migmatite, crossed polars

Migmatite, plane polars

Migmatite, plane polars

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Migmatite, crossed polars

Migmatite, crossed polars

Migmatite in cross polarized light. Magnification: 40x Click here for plane polars: https://youtu.be/5EeQKEAMSpo Click here to explore this slide in plane po…