Definition

Noun: 1. A pure, transparent variety of quartz: Rock crystal is a colorless and clear mineral form of silicon dioxide (SiO₂), valued for its clarity and lack of impurities. It is a specific type of quartz.

Usage

Rock crystal is used as a singular, countable noun. It refers to the specific mineral variety. * It is often found in geological contexts, jewelry, and descriptions of decorative objects. * Example: "The museum displayed a large, flawless rock crystal."

Examples

• The pendant was made from a single piece of polished rock crystal.
• Rock crystal vases were highly prized in ancient times for their beauty and clarity.
• Miners discovered a vein of rock crystal in the mountains.

Advanced Usage

• In Metaphor: Sometimes used poetically or descriptively to denote extreme purity, clarity, or coldness.
  • Her tears were like drops of rock crystal.
• Historical/Archeological Context: Refers to artifacts or items crafted from this material.
  • The Roman goblet, carved from rock crystal, was a masterpiece.

Variants and Related Words

• Quartz (n): The broader mineral family to which rock crystal belongs. All rock crystal is quartz, but not all quartz is rock crystal (e.g., amethyst, citrine, smoky quartz).
• Clear Quartz (n): A direct synonym for rock crystal.
• Crystal (n): A more general term that can refer to rock crystal, but also to any crystalline solid or high-quality glass. Context is needed.

Synonyms

• Clear quartz
• Mountain crystal (less common)

Notes on Meaning

The term "rock crystal" specifically denotes the colorless and transparent form. It is distinguished from other quartz varieties by its lack of color. Its primary meaning is mineralogical.

Noun

1. a clear quartz used in making electronic and optical equipment