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Boscardinite, TlPb4(Sb7As2)Σ=9S18

Posted by Uwe Kolitsch  
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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).
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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?
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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.
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Guenter Blass September 05, 2011 02:52PM
Hi Matteo,

congratulation for your Mineral!!

Günter
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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!

Jolyon
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Domenico Preite September 08, 2011 01:17PM
Congratulazioni, grande Matteo Boscardin per questa specie a te dedicata...
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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.
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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.
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paolo storti October 03, 2011 06:53PM
All'amico Matteo congratulazioni!!!!!
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