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chert
This term describes a specific geological material characterized by its extreme hardness and conchoidal fracture, meaning it breaks along smooth, curved surfaces. It is frequently associated with the creation of prehistoric tools due to its ability to produce razor-sharp edges when flaked.
In a technical context, it is distinguished from flint, which is a variety of chert. While the terms are often used interchangeably in casual conversation, geologists use chert as the broader category for any microcrystalline quartz sedimentary rock, regardless of its specific chemical impurities or color.
Meanings
Examples
The geologist identified a thin layer of chert within the limestone sequence.
Look at this piece of chert. It has a perfect conchoidal fracture.
Ancient peoples often used chert to craft sharp scrapers and arrowheads.
I wonder if this nodule is actually chert or just a hard piece of flint.
The outcrop consists primarily of grey chert and shale.
We found several chert flakes near the prehistoric campsite.
Chert is far too hard to be scratched by a steel nail.
The sample shows that the chert formed from the accumulation of silica-rich organisms.