rock-crystal

A clear rock-crystal sits on the geologist's desk.

Definition

1. Noun:
   • A transparent form of quartz: "rock-crystal" refers to a clear, colorless variety of quartz, often used in jewelry or as a decorative stone. It is valued for its purity and natural crystalline structure.

Usage Examples

• (A piece of jewelry featuring clear quartz.)
• (A natural occurrence of transparent quartz.)
• (Clear quartz samples for display.)

Advanced Usage

• "rock-crystal clear": extremely transparent or pure, like the mineral.

  • The water in the mountain stream was rock-crystal clear. (Exceptionally clean and transparent.)

• "cut like rock-crystal": shaped or polished with sharp, precise facets.

  • The glass vase was cut like rock-crystal, with many facets. (Made to resemble the crystalline form of quartz.)

Variants and Related Words

• Rock crystal (n): alternative spelling, often used interchangeably.

  • The museum had a display of rock crystal specimens. (Same as rock-crystal.)

• Crystalline (adj): resembling or made of crystals.

  • The rock-crystal formation had a crystalline structure. (Having the nature of crystals.)

Synonyms

• Quartz: a common mineral, of which rock-crystal is a clear variety.
• Clear quartz: a transparent form of quartz.
• Mountain crystal: an older term for rock-crystal.

Related Idioms

• "As clear as rock-crystal": extremely clear or obvious.

  • His explanation was as clear as rock-crystal. (Very easy to understand.)

• "A heart of rock-crystal": a metaphor for pure, untainted emotions or intentions.

  • She had a heart of rock-crystal, never holding grudges. (Pure and honest in character.)