Definition

1. Noun:
   • Schist: A type of metamorphic rock characterized by a foliated texture, meaning it can easily split into thin, sheet-like layers. This layering is due to the parallel alignment of platy minerals like mica.

Usage Examples

• Noun:
  • Ngọn núi này chủ yếu được cấu tạo từ diệp thạch. (This mountain is primarily composed of schist.)
  • Các lớp diệp thạch lộ ra dọc theo bờ sông. (The layers of schist are exposed along the riverbank.)

Advanced Usage

• The term is a specialized geological term. In common language, it is often simply referred to as "đá biến chất" (metamorphic rock), with "diệp thạch" specifying the foliated type.
• It can be part of compound rock names specifying the mineral composition, e.g., "diệp thạch mica" (mica schist).

Variants and Related Words

• Đá phiến: This is a more general term for "slate" or "shale," which are also finely layered rocks. "Diệp thạch" (schist) typically has coarser grains and more pronounced mineral alignment than "đá phiến."
• Đá biến chất: Metamorphic rock (the general category).
• Phyllite: A metamorphic rock of a grade between slate and schist, sometimes referred to in Vietnamese contexts but less commonly than "diệp thạch."

Synonyms

• Schist (English loanword used in technical contexts).
• Đá phân phiến (a descriptive synonym meaning "foliated rock," though less common).

Related Phrases / Compound Terms

• Dãy núi diệp thạch: Schist mountain range.
• Đới diệp thạch: Schist zone.
• Hóa thạch trong diệp thạch: Fossil in schist.

1. Schist