Manganese accommodation in fossilised mastodon ivory and heat-induced colour transformation Evidence by EXAFS
作者： Ina Reiche , Guillaume Morin , Christian Brouder , Vicente Armando Solé , Pierre-Emmanuel Petit
DOI: 10.1127/0935-1221/2002/0014-1069
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摘要: Odontolite or bone turquoise, a turquoise-blue coloured heated fossilised mastodon ivory bone, is an imitation of the mineral turquoise used for decoration medieval art objects. Its colour origin can be ascribed to Mn 5+ traces in tetrahedral environment four oxygen atoms apatite matrix. The structural was investigated by means extended X-ray absorption fine structure (EXAFS) order shed new light on transformation induced thermal treatment. This particularly difficult as manganese concentration does not exceed trace amounts ivory. EXAFS experiments confirm presence 2+/3+/4+ ions before and after treatment location P analogous site apatite.
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