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Sphalerite, Falcacci stope, Elba Island.

Last Updated: 20th Nov 2013

By Giuliano Bettini

In 1991, I collected many of these specimens at Falcacci stope, Rio Marina, Elba island.
They were mostly (and perhaps still are ....) dispersed in a green chloritic clay (Ref: Orlandi, P., & Pezzotta, F. (1997). Minerali dell'Isola d'Elba. Edizioni Novecento Grafico, Bergamo).
That’s probably the variety Marmatite. The bigger crystals are often imperfect, while the smaller ones (size: a few mm) are perfect and shiny. The faces are those of the cube and the tetrahedron.
Washing with water, the crystals are freed easily from the clay.





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Comments

Thanks Giuliano, interesting note. You refer to Orlandi&Pezzotta as reference, but then you say "that's probably the variety marmatite". Don't they mention what variety of sphalerite is that in their publication?

Chris Mavris
20th Nov 2013 8:03pm
Thanks Chris.
No, however,they explicitly speak of "Sfalerite ferrifera" (p. 67, Iron-rich Sphalerite).

Giuliano Bettini
21st Nov 2013 3:35am

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