tự hình

Tinh thể thạch anh có dạng tự hình lục lăng.

Definition

1. Noun:
   • Idiomorph: In geology and mineralogy, a crystal that has developed its own characteristic outward crystal form because it grew in an environment where it was not constrained by surrounding minerals. It is bounded by its own crystal faces.
   • Euhedral crystal: A synonym for a well-formed, idiomorphic crystal.

Usage Examples

• Noun:
  • Trong mẫu đá này, các tinh thể thạch anh là tự hình. (In this rock sample, the quartz crystals are idiomorphic.)
  • Tự hình là đặc trưng của các khoáng vật hình thành đầu tiên từ dung dịch magma. (Idiomorphs are characteristic of minerals that crystallize first from a magma solution.)

Advanced Usage

• The term is primarily technical and used in scientific descriptions of rocks and minerals. It is often contrasted with "tự hình một phần" (subhedral) and "không tự hình" (anhedral).

Variants and Related Words

• Tự hình một phần (Subhedral): A crystal that is only partly bounded by its own crystal faces.
• Không tự hình (Anhedral): A crystal that lacks its own crystal faces because its growth was constrained by surrounding minerals.

Synonyms

• Idiomorph
• Euhedral crystal
• Automorphic

Related Terms

• Hình thái tinh thể (Crystal morphology): The study of the external shape and form of crystals.
• Cát khai (Cleavage): The tendency of a mineral to break along flat planes, which is different from its external crystal form (tự hình).