Other examples can be seen at Llanddwyn Island in Wales. A remarkable, pale, blue-green jasper, with patterns somewhat resembling those of malachite, occurs in a deposit at Ettutkan Mountain, Staryi Sibay, Bashkortostan, Russia. (The town of Sibay, in the far south of the Ural Mountains, near the border with Kazakhstan, is noted for its colossal, open-cast copper mine). Basanite is a deep velvety-black variety of amorphous quartz, of a slightly tougher and finer grain than jasper, and less splintery than hornstone. It was the "Lydian stone" or "touchstone" of the ancients. It is mentioned and its use described in the writings of Bacchylides about 450 B.C., and was also described by Theophrastus in his book "On Stones" (Ancient Greek title: Περὶ λίθων: "Peri Lithon"), a century later. It is evident that the touchstone that Pliny had in mind when he wrote about it was merely a dense variety of basalt. Some touchstone is, in reality, a very fine-grained sedimentary stone allied to quartzite, but it may be just as useful for testing purposes. Basanite, "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. As the Mindat.org website points out, 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.