chert

Noun

A hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline silica.

ریشه

The word 'chert' comes from the Old English word 'ceart', which is derived from the Proto-Germanic word 'kertan'.

مثال

• The archaeologist found a piece of chert that was used as a tool by ancient humans.
• Chert is commonly used in the construction of stone tools.
• The cliffs along the coast are made of layers of chert.

ترکیب‌های رایج

Chert rock Chert formation Chert layer Chert tool