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Petrogenesis of Basalt-hosted sapphires from the Siebengebirge Volcanic Field (SVF) in western Germany
(2016-04-29)
Megacysts of blue sapphires are hosted by alkaline mafic rocks from the Cenozoic Siebengebirge Volcanic Field (SVF) in western Germany. Similar occurrences of sapphires related to intra-continental alkaline mafic volcanism ...