Definition

1. Noun:
   • A white mineral consisting of silica: Cristobalite is a specific, crystalline form of silicon dioxide (SiO₂).
   • Found in volcanic rocks: It is a high-temperature polymorph of quartz, typically formed in volcanic environments.

Usage Examples

• Noun:
  • The geologist identified the white crystals in the lava sample as cristobalite.
  • Cristobalite and tridymite are common silica minerals found in volcanic rocks.

Advanced Usage

• Scientific Context: In materials science and geology, "cristobalite" refers specifically to the tetragonal or cubic crystalline structure of silica stable at high temperatures, often analyzed using X-ray diffraction.
  • The presence of cristobalite in this ash indicates it was subjected to extremely high temperatures.

Variants and Related Words

• Silica (n): A chemical compound (SiO₂) that is the main component of minerals like quartz, cristobalite, and tridymite.
• Quartz (n): The most common and stable crystalline form of silica at Earth's surface temperatures.
• Tridymite (n): Another high-temperature polymorph of silica, often found alongside cristobalite in volcanic rocks.

Synonyms

• Silica mineral: A general term for minerals composed primarily of silicon dioxide.
• High-temperature quartz: An informal descriptive term sometimes used for cristobalite in geological contexts.

Notes

• Cristobalite is not typically used in idioms or phrasal verbs due to its highly specific, scientific nature. Its usage is almost exclusively confined to technical fields such as geology, volcanology, and materials science.

Noun

1. a white mineral consisting of silica; found in volcanic rocks