chert

Plural: cherts

Noun

• A hard, fine-grained sedimentary rock, a form of quartz.
• variety of silica containing microcrystalline quartz
• Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.
• A flint-like tool made from chert.

Examples

• Finding CHERT among his letters, he chipped away at his opponent’s lead.

Related Words

chalcedony, flint, jasper, quartzite, silicate