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PhotosStilbite - Forra di Bulla, Ortisei, Siusi Alp, Gardena Valley, Bolzano Province, Trentino-Alto Adige, Italy
1st Dec 2016 20:08 UTCKo Jansen
regards Ko Jansen.
2nd Dec 2016 08:17 UTCVolker Betz 🌟 Expert
indeed, this "Puflerite" is a unusual form of stilbite and thomsonite-balls are very similar.
This appearence of stilbite is not common, but in this case it was analyzed as early as 1873 and has a SiO2 content of 55,6 %. Thomsonite contains only about 40%SiO2.
(cited from Doelter, Handbuch der Mineralchemie, II. 3. Teil (1921), page 154)
I am not waware of recent analytical results.
The location is now more or less historical and samplles present on most "old" collections.
Volker
3rd Dec 2016 12:46 UTCPaolo Bosio
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