Gedanite and Gedano-Succinite

Abstract
Helm described two fossil resins occurring with succinite: Gedanite, which he thought to have a botanical source other than that of succinite, and "friable amber", which he held to be a diagenetic variant of succinite. Savkevich considered both resins to be diagenetic variant of succinite and named the "friable amber" gedano-succinite. This reports the study by FTIR and GC-MS of the nine specimens labeled 'gedanite' in mineralogical collections of Europe and the U.S.A. Seventy identified components, including 18 diterpene resin acid derivatives, are essentially the same as have been reported in the soluble fraction of succinite. Gedanite and gedano-succinite can be distinguished by their succinic acid content and by their IR spectra. Most of the presumed gedanites in the collection are, in fact, gedano-succinite; one is ordinary succinite. The close similarity of the components distribution of all three resins suggests that all share a common botanical source.
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