iolite

A geologist holds a piece of iolite up to the light.

Definition

Noun: - A mineral: "iolite" is a blue or violet-blue mineral, also known as cordierite, composed of magnesium, aluminum, and silica. It is often used as a gemstone.

Usage Examples

• (The mineral was used as a gemstone in jewelry.)
• (The mineral was recognized by its appearance.)

Advanced Usage

• "iolite's pleochroism": iolite exhibits pleochroism, meaning it shows different colors (blue, violet, and pale yellow) when viewed from different angles.
  • The gem cutter oriented the iolite to display its best blue color, taking advantage of its pleochroism. (The cutter used the mineral's property to enhance its appearance.)

Variants and Related Words

• Cordierite (n): the scientific name for iolite, often used in mineralogy.
  • Cordierite is commonly found in metamorphic rocks. (The mineral is associated with certain rock formations.)

Synonyms

• Cordierite: the standard mineralogical term for iolite.
• Dichroite: an older name for iolite, referring to its two-color pleochroism.

Related Idioms