2 Sentences With "Lydian stone"

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Dake, H.C., Fleener, Frank L. and Wilson, Ben Hur, Quartz Family > Minerals: A Handbook for the Mineral Collector, pub. Whittlesey House, a > division of the McGraw Hill Book Company, Inc. 1938. Basanite (not to be confused with bassanite), Lydian stone, and radiolarite (a.k.a. lydite or flinty slate) are terms used to refer to several types of black, jasper-like rock (also including tuffs, cherts and siltstones) which are dense, fine-grained and flinty / cherty in texture and found in a number of localities.
The "Lydian Stone" known to the Ancient Greeks is named for the ancient kingdom of Lydia in what is now western Turkey. A similar rock type occurs in New England. Such rock types have long been used for the making of touchstones to test the purity of precious metal alloys, because they are hard enough to scratch such metals, which, if drawn (scraped) across them, show to advantage their metallic streaks of various (diagnostic) colours, against the dark background. There are, confusingly, not one but two rocks called Basanite, one being a black form of jasper and the other a black volcanic rock closely akin to basalt.