1. Plural of cordierite; a hard, glassy mineral composed of magnesium aluminum silicate, typically blue or violet in color, used in gemstones and industrial applications.
Usage: mineralogy; geology

Examples

• The geologist identified several cordierites in the metamorphic rock sample.
• Cordierites are valued as gemstones due to their attractive blue coloration.
• These cordierites formed under high-pressure conditions deep within the Earth.
• The museum's mineral collection includes rare cordierites from Sri Lanka.
• Industrial applications of cordierites include use in high-temperature ceramics.