macle

A student examines a macle in a geology sample.

Definition

Noun (Mineralogy): 1. A twinned crystal: In mineralogy, "macle" refers to a type of crystal that is composed of two or more parts that are symmetrically arranged, often appearing as a double or intergrown structure. This is a specific term for a twinned crystal formation. 2. A dark spot or inclusion: "Macle" can also denote a black or dark spot or inclusion found within certain minerals, such as in quartz or other transparent stones.

Usage Examples

• (A twinned crystal with symmetrical parts.)
• (A dark spot or inclusion within the mineral.)

Advanced Usage

• "Macle formation": The process or occurrence of twinned crystals growing together.

  • Geologists study macle formation to understand the cooling history of igneous rocks. (The development of twinned crystals.)

• "Macle in gemology": Used to describe a flaw or characteristic in gemstones that can affect their value.

  • A macle in a diamond is sometimes considered a unique feature rather than a defect. (A dark inclusion or twinning pattern.)

Variants and Related Words

• Macled (adj): Having or characterized by a macle; twinned.

  • The macled crystal was a rare find in the quarry. (The crystal exhibited twinning.)

• Macling (n): The process of forming a macle.

  • Macling occurs when crystals grow in a specific geometric pattern. (The formation of twinned crystals.)

Synonyms

• Twin crystal: A crystal composed of two or more symmetrically arranged parts.
• Inclusion: A foreign substance or spot within a mineral (for the second meaning).
• Blemish: A dark spot or mark (for the second meaning, in a general sense).

Related Idioms

• "A macle in the rough": An idiomatic expression (rare) referring to a hidden flaw or unique feature in something that appears ordinary.
  • The old painting had a macle in the rough — a tiny crack that actually increased its value. (A hidden, distinctive characteristic.)

Phrasal Verbs

• "Macle out": A very rare, technical verb meaning to form a twinned crystal.
  • The mineral began to macle out as the temperature dropped. (To develop into a twinned crystal.)