Which rock is typically non-foliated?

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Multiple Choice

Which rock is typically non-foliated?

Explanation:
Foliation forms when metamorphic rocks undergo directed pressure, causing minerals to align into parallel planes. Marble forms from limestone under heat and pressure, but the pressure is often not strongly directional, so calcite grains recrystallize into an interlocking mosaic rather than layers. This gives marble a non‑foliated texture. In contrast, slate, schist, and gneiss develop foliation: slate shows a slaty cleavage, schist has aligned platy minerals creating schistosity, and gneiss displays banded mineral layers. Hence marble is typically non-foliated.

Foliation forms when metamorphic rocks undergo directed pressure, causing minerals to align into parallel planes. Marble forms from limestone under heat and pressure, but the pressure is often not strongly directional, so calcite grains recrystallize into an interlocking mosaic rather than layers. This gives marble a non‑foliated texture. In contrast, slate, schist, and gneiss develop foliation: slate shows a slaty cleavage, schist has aligned platy minerals creating schistosity, and gneiss displays banded mineral layers. Hence marble is typically non-foliated.

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