Definitionn. variety of silica containing microcrystalline quartz
Last update: June 11, 2015
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Beds and nodules of chert are abundant in the upper parts of the limestone; at Bakewell it is quarried for use in the Potteries. [Please select]
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The chert decomposes deeply, and assumes a rough brown granular surface, deeply worn and furrowed. [Please select]
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It is made of gray chert, the edge highly polished. [Please select]
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Relics are very abundant here, especially the small chert "thumb-scrapers," which outnumber all other specimens. [Please select]
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The Cumberland and Westmoreland hills are, in general, composed of clay-slate and gray-wacke, with occasional masses of chert[7] (like that which forms the summit of Scawfell), porphyritic greenstone, and syenite. [Please select]
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