1. a hard crystalline mineral composed of silicon dioxide, commonly found in rocks and used in making glass and electronic devices

Examples

• The geologist identified several quartz crystals in the rock sample.
• Quartz is one of the most abundant minerals on Earth.
• The watch uses a quartz movement for accurate timekeeping.
• She collected beautiful pink quartz specimens during her hike.
• The countertop was made of engineered quartz material.
• Clear quartz crystals are often used in jewelry making.