Which texture indicates metamorphism under uniform, non-directed stress?

• A. A non-foliated metamorphic texture.
• B. A foliated texture.
• C. A sedimentary rock type.
• D. A volcanic glass.

Answer: (A)

When metamorphism happens under pressure that is the same in all directions, minerals recrystallize without building any alignment, so the rock develops a non-foliated, granular texture. The lack of a preferred orientation means there’s no banding or layering—crystals grow in roughly random orientations, yielding a uniform, grainless or evenly granular look. Marble and quartzite are common examples of this texture, formed when heat and uniform pressure drive recrystallization without directional stress.

If the stress were directed, minerals would align into layers or sheets, creating a foliated texture, which is the opposite situation. The other choices describe rocks or textures not showing this metamorphic response to uniform stress.