Which statement describes non-foliated metamorphic rocks?

• A. They lack preferred mineral orientation.
• B. They have parallel mineral bands.
• C. They have no mineral content.
• D. They form only from cementation of sediments.

Answer: (A)

Non-foliated metamorphic rocks form under conditions where pressure is not directional, so minerals recrystallize without aligning into layers. This produces a texture without a preferred mineral orientation, which is exactly what non-foliated rocks exhibit. Minerals grow or interlock in a more random, granular texture—examples include marble and quartzite.

The other descriptions don’t fit: having parallel mineral bands describes foliated rocks, not non-foliated; having no mineral content isn't possible for metamorphic rocks, which are defined by minerals; and forming from cementation of sediments describes sedimentary rocks, not metamorphic.