That is a difficult question. It is unlikely there is much textural difference. It might be necessary to study chemical zoning. One possibility is that garnets in an igneous rock might be xenocrysts.
The most important difference between metamorphic and igneous garnets lies in their formation processes and resulting characteristics:
Formation Environment is the key difference between metamorphic & Igneous Garnets.
Metamorphic Garnets form under intense heat and pressure deep within the Earth's crust.They are commonly found in metamorphic rocks like gneiss, schist, and granulite.
Igneous Garnets form from the solidification of molten rock (magma or lava) found in igneous rocks like granites, pegmatites, and peridotites.
Metamorphic garnets often contain inclusions of other minerals,But igneous garnets may have a more homogenous composition.
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