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Field CollectingTremolite on talc: location?

18th Feb 2020 21:49 GMTRaymond Dedeyne

This specimen (200 x 145x 55 mm) comes from an old collection and was labeled "pargasite on calcite from Luc Yen, Vietnam". Analysis (both SEM/EDX and XRD) showed this to be tremolite on massive snow white talc instead. As a location. Luc Yen is doubtful. Anyone an idea where this could come from? Maybe the striations on the matrix - applied to "embellish" the specimen - point to some tourist destination?

19th Feb 2020 09:04 GMTKeith Compton Manager


Perhaps see this reference:

Dumas, A., Martin, F., Ngo ke, T., Nguyen van, H., Viet, D.N., Tat, V.N., Quy, N.K., Micoud, P. Parseval, P. (2015) The crystal-chemistry of Vietnamese talcs from the Thanh Son district (Phu Tho province, Vietnam). Clay Minerals, 50(5), 607-617.
Those "embellishments" are just the scrapings from the tools used to remove the talc. Similar to the scrapings often evident in Almandine garnet specimens from Tyrol, Austria. So I wouldn't consider them to be specifically "tourist" focused. 

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