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  1. An extrusive rock composed of calcic plagioclase, augite, olivine, and a feldspathoid (nepheline, leucite, or analcime); essentially, a feldspathoidal olivine basalt. Some basanites have been the source of sapphires or rubies. AGI
  2. A touchstone consisting of flinty jasper or finely crystalline quartzite. Syn: touchstone; Lydian stone. AGI
  3. A black variety of jasper. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

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