Which metamorphic texture shows parallel mineral grains arranged in layers?

Which metamorphic texture shows parallel mineral grains arranged in layers?

• A. Non-foliated
• B. Foliated
• C. Glassy
• D. Porphyritic

Answer: (B)

Foliation is the texture produced when directional pressure during metamorphism causes minerals to realign into parallel layers. The parallel grains arranged in layers are the telltale sign of foliation, reflecting the stress direction that lined up the minerals and created sheet-like bands. Rocks such as slate and schist demonstrate this layered appearance. Non-foliated rocks lack such alignment, glassy textures are smooth from rapid cooling of molten material, and porphyritic textures feature crystals of different sizes without any layered arrangement.

Foliation is the texture produced when directional pressure during metamorphism causes minerals to realign into parallel layers. The parallel grains arranged in layers are the telltale sign of foliation, reflecting the stress direction that lined up the minerals and created sheet-like bands. Rocks such as slate and schist demonstrate this layered appearance. Non-foliated rocks lack such alignment, glassy textures are smooth from rapid cooling of molten material, and porphyritic textures feature crystals of different sizes without any layered arrangement.