Which metamorphic rocks do not have banded layers?

Which metamorphic rocks do not have banded layers?

• A. Non-Foliated
• B. Foliated
• C. Sedimentary
• D. Igneous

Answer: (A)

Foliation is the alignment of minerals into parallel layers that forms when metamorphic rocks are subjected to directed pressure, causing minerals like mica to line up into sheets and create banded layers. Rocks that have experienced this stress develop foliated textures with visible layering. When metamorphism is driven mainly by heat with little directional stress, minerals recrystallize in many directions and the rock lacks that alignment, resulting in a non-foliated texture without banded layers. So, non-foliated metamorphic rocks do not show banding. Marble and quartzite are common examples. In contrast, foliated rocks such as slate and schist display clear banding. The other options describe rock types that are not metamorphic, so they don’t exhibit this texture distinction.

Foliation is the alignment of minerals into parallel layers that forms when metamorphic rocks are subjected to directed pressure, causing minerals like mica to line up into sheets and create banded layers. Rocks that have experienced this stress develop foliated textures with visible layering. When metamorphism is driven mainly by heat with little directional stress, minerals recrystallize in many directions and the rock lacks that alignment, resulting in a non-foliated texture without banded layers. So, non-foliated metamorphic rocks do not show banding. Marble and quartzite are common examples. In contrast, foliated rocks such as slate and schist display clear banding. The other options describe rock types that are not metamorphic, so they don’t exhibit this texture distinction.