Definition

1. Noun:
   • Schist: A type of metamorphic rock characterized by a foliated structure, meaning it can easily split into thin, flat layers or sheets. This foliation is typically due to the parallel arrangement of platy minerals like mica.
   • Slate (in a broader, less technical sense): While 'đá phiến' can sometimes be used more loosely to refer to fissile rocks like slate, its primary and most accurate geological equivalent is schist.

Usage Examples

• Noun:
  • Ngọn núi này được cấu tạo chủ yếu từ đá phiến. (This mountain is primarily composed of schist.)
  • Họ khai thác đá phiến để sử dụng trong xây dựng. (They quarry schist for use in construction.)
  • Lớp đá phiến này có thể tách ra thành những tấm mỏng. (This layer of schist can be split into thin sheets.)

Advanced Usage

• "dạng đá phiến" (schistose): Having the texture or appearance of schist.
  • Đá ở đây có cấu tạo dạng đá phiến. (The rock here has a schistose structure.)

Variants and Related Words

• Đá bảng (Slate): A fine-grained, foliated metamorphic rock that splits into smooth, flat pieces. It is a specific type of rock distinct from schist.
• Đá phiến sét (Shale): A sedimentary rock that can be a precursor to slate and schist through metamorphism.
• Đá biến chất (Metamorphic rock): The general category of rocks formed by heat and pressure, which includes schist.

Synonyms

• Schist (in geological context).
• Fissile rock (describing its property of splitting).

Related Phrases

• "Tầng đá phiến": A schist layer or schist stratum.
  • Các nhà địa chất đang nghiên cứu tầng đá phiến cổ này. (Geologists are studying this ancient schist layer.)
• "Đá phiến quang" (Mica schist): A common type of schist rich in mica minerals.
  • Đá phiến quang lấp lánh dưới ánh mặt trời. (Mica schist glitters in the sunlight.)

1. Schist