Spanish Jet: Something More Than a Gemstone with Magical Properties
نویسنده
چکیده
Apart from the history and traditions associated with this material, there are several questions that need to be answered. What exactly is Spanish jet? What is its nature? What are the reasons for its special properties and, above all, why has it retained its reputation over so many years as an unalterable material throughout time? Spanish jet is a humic coal, conventionally assimilated to a variety of lignite coals. It is black in color, bright, light, compact, and I. Suárez-Ruiz Instituto Nacional del Carbón (INCAR-CSIC)
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