File:Rainbow Andradite Crystal.jpg
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English: Crystal size: 8 mm.
Mining location: Kitozumi, Tenkawa Village, Yoshino District, Nara Province, Japan. "Rainbow andradite" is the name given to strongly iridescent specimens of the Andradite garnet species, most of which seem to originate from the Nara Province in Japan. Comprehensive information on this topic is to be found here: http://www.gia.edu/gems-gemology/winter-2006-iridescence-rainbow-andradite-japan-hainschwangFrançais : Taille de l'échantillon: 8 mm.
Provenance : Kitozumi, commune de Tenkawa, district de Yoshino, province de Nara, Japon. On appelle "andradite arc-en-ciel" les grenats de la variété andradite et présentant une exceptionnelle iridescence sur certaines, sinon sur toutes les faces du cristal. De taille généralement modeste, ces spécimens sont de couleur brun-orangée et constitués presque exclusivement d'andradite. L'iridescence est due à la présence de deux types de structures lamellaires différentes dans le cristal, lesquelles causent une diffraction de la lumière qui apparaîtra avec presque toutes les couleurs du spectre sous un certain angle. Des informations plus détaillées à ce sujet se trouvent à cette adresse : http://www.gia.edu/gems-gemology/winter-2006-iridescence-rainbow-andradite-japan-hainschwang |
| Date | |
| Source | Own work |
| Author | ButtShark |
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| current | 15:32, 12 December 2014 | | 2,441 × 2,441 (4.14 MB) | ButtShark (talk | contribs) | User created page with UploadWizard |
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