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Rhodostannite

Posted by Rock Currier  
avatar Rhodostannite
January 02, 2009 09:28PM
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Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities.


Rhodostannite Micro? and rare species collections.
Cu2FeSn3S8
Normally a very fine grained massive material known mostly in polished sections or probe mounts of ore from tin mines. Known from less than a half dozen localities. "Although I am no expert on analytical methods, given the chemical similarity of Rhodostannite to Ferrokesterite, a very careful analysis should be necessary to tell them apart. Even if the sample has been analyzed by SEM and seem to have the right components and form for rhodostannite there can still be some doubts as to the precise ID of the mineral"1
1.Lefteris Rantos, email communication 2009.

Frank Keutsch on the other hand says "In my experience using EDS on clean surfaces of these xx or xx -fragments it has been pretty clear which ones are rhodostannite or kesterite/ferrokesterite/stannite, and I have looked at quite a lot..."
[Frank Keutsch, email 2010]


Rhodostannite
Bolivia
Oruro Department, Cercado Province, Oruro City, Itos/San José Mine.
Octahedral Rhodostannite crystals on an Andorite crystal FOV 20mm© David K. Joyce

The full caption of the above image reads: These tiny, 0.5mm rhodostannite crystals on andorite were analysed by SEM and seem to have the right components and form for rhodostannite. Field of view is about 20mm. Private collection.

As well formed sharp black octahedrons up to about .15 mm partially embedded in the faces of andorite crystals. These were brought back to the United States in 2002 by Alfredo Petrov and identified on the microprobe of Excalibur minerals.

Andorite crystals are quite common in Oruro, having been found in many veins and pockets over the course of several decades. Unfortunately, the rhodostannites seem to have come out only once or twice, many years ago. The pieces I brought to the USA in 2002, and others brought out by Jaroslav Hyrsl, all came from old collections in Bolivia, not contemporary production. The andorite matrix crystals were all similar enough that they may have come from a single find. The andorites are relatively flatter and less complex than more recent andorite finds. What I'm trying to say is that if you have some of the recent andorites from the early 1990s onwards, the presence of rhodostannite is very unlikely.
[Alfredo Petrov 2009]



Click here to view Best Minerals R and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 12 time(s). Last edit at 11/14/2010 10:35AM by Rock Currier.
avatar Re: Rhodostannite
January 03, 2009 01:17AM
ca    
Thanks so much. I'm off to check my andorite. Actually I would have expected tetrahedrons. Octos eh?



Edited 1 time(s). Last edit at 01/03/2009 01:18AM by Rob Woodside.
Re: Rhodostannite
March 15, 2009 09:56PM
Andorite crystals are quite common in Oruro, having been found in many veins and pockets over the course of several decades. Unfortunately, the rhodostannites seem to have come out only once or twice, many years ago. The pieces I brought to the USA in 2002, and others brought out by Jaroslav Hyrsl, all came from old collections in Bolivia, not contemporary production. The andorite matrix crystals were all similar enough that they may have come from a single find. The andorites are relatively flatter and less complex than more recent andorite finds. What I'm trying to say is that if you have some of the recent andorites from the early 1990s onwards, the presence of rhodostannite is very unlikely. ;-((
avatar Re: Rhodostannite
April 21, 2009 07:48PM
ca    
Right you are, My andorite was barren!!!
Re: Rhodostannite
April 21, 2009 08:10PM
gr    
Hi,

I recall seeing these tiny xls on the faces of large, flat tabular Andorite xls identified as Ferrokesterite.
Given the chemical similarity of Rhodostannite to Ferrokesterite, a very careful analysis should be necessary to tell them apart.

Although I am no expert on analytical methods, the caption in the Rhodostannite photo (http://www.mindat.org/photo-81343.html) stating "analysed by SEM and seem to have the right components and form for rhodostannite" could leave some doubts as to the precise ID of the xls.

Anyone aware of more detailed analytical results on these?

Lefteris.
Re: Rhodostannite
November 14, 2010 05:03AM
in my experience using EDS on clean surfaces of these xx or xx -fragments it has been pretty clear which ones are rhodostannite or kesterite/ferrokesterite/stannite, and I have looked at quite a lot...
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