chert

• The majority of the Boulder knives are made from a sedimentary rock called tiger chert, which Clovis people would have been able to sculpt in several ways.
• Of all of the knives made out of chert, flint or quartzite, the Harahey has been manufactured from more varieties of stone than any of the other knives I have mentioned.
• Before I start writing about a couple of stone knives indigenous to East Texas, I suggest you keep in mind nearly all of the previously discussed knives have been made out of a high quality chert or a piece of dolomite which is the material known as Alibates flint.
• In East Texas it is a totally different situation because there are no deposits of chert, flint or quartzite found anywhere in the Piney Woods with the exception of the Manning Fused Glass formation found in the Walker County and surrounding areas near Huntsville.
• It commences with the beds of the MOUNTAIN LIMESTONE, which, in some situations, as in Derbyshire and Ireland, are of great thickness, being alternated with chert (a siliceous sandstone), sandstones, shales, and beds of coal, generally of the harder and less bituminous kind (anthracite), the whole being covered in some places by the millstone grit, a siliceous conglomerate composed of the detritus of the primary rocks. —  Vestiges of the Natural History of Creation

Allen's Synonyms and Antonyms

Used in the Same Context