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Références complémentaires sur le web :
- Mindat.org (EN)
- Webmineral.com (EN)
- Euromin.w3sites.net (EN/FR)
- Minerals.net (EN)
- Galleries.com (EN)
- Gemsdat.be (EN)
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- Donald Kasper : géochimie des Jaspes et Agates (EN)
- Gemologyproject.com (EN)
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- Minerals.caltech.edu (EN)
- Agates with inclusions (EN)
- Musée Gitche Gumee de l'Agate, USA (EN)
- Cst.cmich.edu (EN)
- Achat-almanach (EN/DE)
- Neverov O., Antique cameos (EN)
- Flintsource.net (Flint) (EN)
- Synthetic Quartz Crystal - Ndk.com (EN)
- What is synthetic Quartz - Tew.co.jp (EN) |
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