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| | Links to good information |
 | | Also a Richard Hughes bibliography, most of which is available on-line as well, and interesting articles on othe minerals (gems) |
 | | Richard Dillen has compiled type localities and references for Ardennite, Davreuxite, Delvauxite, Diadochite, Drugmanite, Ferristrunzite, Fraipontite, Halloysite, Hopeite, Koninckite, Ottrelite, Richellite, Vantasselite, Viaeneite, Viseite, Willemite, with images and detailed descriptions of some. |
 | | The gemology site of Corundum afficionado and author Richard Hughes with selections from his book 'Ruby & Sapphire' |
| www.hedegaard.com /Links (6093 words) |
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