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Boscardinite, TlPb4(Sb7As2)Σ=9S18

Posted by Uwe Kolitsch  
Uwe Kolitsch August 28, 2011 05:07PM
Orlandi, P., Biagioni, C., Bonaccorsi, E., Moëlo, Y., Paar, W. (2011): Lead–antimony sulfosalts from Tuscany (Italy). XII. Boscardinite, TlPb4(Sb7As2)Σ=9S18, a new mineral from the Monte Arsiccio mine (Tuscany, Italy): occurrence and crystal structure. Canadian Mineralogist, 49, (in press).
Jeff Weissman August 29, 2011 02:32PM
Someone help me out with this formula, why isn't (Sb7As2) sufficient? Why do you need to do simple arithmetic in the formula?
Uwe Kolitsch August 29, 2011 03:50PM
It's a matter of taste. Sum symbols in such cases imply that the ratio of the elements in the parentheses are or may be variable to some extent.
Guenter Blass September 05, 2011 02:52PM
Hi Matteo,

congratulation for your Mineral!!

Jolyon & Katya Ralph September 05, 2011 04:02PM
>Sum symbols in such cases imply that the ratio of the elements in the parentheses are or may be variable to some extent.

Why invent a new format when (Sb,As) seems more logical? I'm sure there's a good reason - but I guess I'll have to wait until it's published to know!

Domenico Preite September 08, 2011 01:17PM
Congratulazioni, grande Matteo Boscardin per questa specie a te dedicata...
Erik Vercammen September 08, 2011 04:08PM
I suppose that as Sb and As have a fixed number, the brackets are superfluous. But maybe they are used to show the total of As+Sb and so the relationship with other sulfosalts.

Edited 1 time(s). Last edit at 09/08/2011 04:09PM by Erik Vercammen.
Manuele Moro September 09, 2011 01:50AM
Great Matteo, correct and deserved prize for the one who has given a lot to the study of the Italian mineralogy. Manuele.
paolo storti October 03, 2011 06:53PM
All'amico Matteo congratulazioni!!!!!
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