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Ruthenium

Posted by Rock Currier  
avatar Ruthenium
January 02, 2009 09:49PM
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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?


Ruthenium
Ru Hexagonal
Here will go general comments about Ruthenium specimens.
Ruthenium is a native element found almost exclusively in heavy alluvial concentrates mixed with platinum and other metallic elements and minerals. The handbook of mineralogy sites a tabular crystal 35x7 millimicrons partly included in platy rutheniridosmine, and in platinum and a single locality of Uryu River, near Horokanai, Hokkaido, Japan. The mineral is named from the Latin Ruthenia which means Ukraine or Russia.1 Ruthenium is used to make platinum and other alloys harder and more durable among other industrial applications.
1. Handbook of Mineralogy, Vol.1, Anthony, Bideaux, Bladh & Nichols p.454.
[Rock Currier 2009]


Ruthenium
Ru hexagonal
Ethiopia
Wallaga Province, Assosa Region, Tumet River
SEM image, very small Ru nugget© Pavel M. Kartashov


Site photos one two three four five..
From 10 g of gold concentrate from Tumet I selected 9 grains of PGM minerals. Most of them belonged to the Os-Ir-Ru ternary system - native iridium, osmium and ruthenium according to current nomenclature. Only two grains had contained Pt minerals with minor inclusions of isoferroplatinum and sperrylite. Also one grain of irarsite was identified. In the local gold market in the village of Qurah I saw about 15 g gold concentrate that contained about two dozen mirror bright hexagonal crystals of Os-Ir-Ru minerals up to 1-1.5 mm in association with some bright-green chrome silicates. The source of PGM minerals in the placers of the Tumet river is a serpentinitized dunite body which has a significant chromite content.
[Pavel Kartashov, 3 January 2009]


Ruthenium
Russia
Urals Region, Middle Urals, Ekaterinburgskaya (Sverdlovskaya) Oblast', Neiva river, Sysert' District, Verkhneivinsk
Ruthenium xl. aggregate 0.5mm© 2008, JGW


We need someone to tell us about the Ruthenium from this locality.


Ruthenium
Russia
Urals Region, Ekaterinburgskaya (Sverdlovskaya) Oblast', Sysert' district, Neiva River.
A sub millimeter size nugget of Ru© Pavel M. Kartashov


The nugget pictured above was taken from PGM concentrate concentrates from the Neiva River. The concentrates contained only a very few grains of gold and a mixture of native tin, magnesioalumochromate, magnetite and zircon. From 22 analysed PGM grains in the concentrate 3 were ruthenium, 6 iridium and other osmium-dominant. The largest Ru-dominant crystal which I found was 3.5 mm size and its surface was enriched with lead up to 22 % Pb. Unfortunately this specimen was lost during the repairs to my lab.
[Pavel Kartashov, 3 January 2009]


Ruthenium
USA
Oregon, southern
Cal Graeber has a small half inch specimen that weighs about 4.5 grams and a largest dimension of 1.2 cm. What he has to say about it is worth recording. "I had Tony Nikischer do the work on the piece. The nugget is composed of an aggregate of micro hexagonal crystal. The piece is unique to my knowledge. A smaller piece went to Mike Ffeingloss. The specimen was originally from the Museum of Natural history in Paris through John Saul and the vague southern Oregon locality was the only information on the label."1
1. Personal communication with Cal Graeber, a mineral dealer in Fallbrook, California, USA, 2009. Mark Feingooss is a well know species collector in Durham, North Carolina, USA.
[Rock Currier, 2 January 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 18 time(s). Last edit at 03/26/2012 06:14PM by Rock Currier.
avatar Re: Ruthenium
January 03, 2009 01:16AM
    
In earlier discussions someone, Alfredo?, complained that the analysed accepted Native Ruthenium had just over 33% Ru. According to IMA rules, if a lattice site had 10 elements, 9 less than 10% and one with more than 10 %, it would be named for the more than 10% majority element. Last Denver Gunnar Farber had some much purer probed Ru grains. I've forgotten the % and the locality.
avatar Re: Ruthenium
January 03, 2009 04:46AM
Well, what is certain is that we need to find someone that knows more than us to flesh out the above article on Ruthenium.

Rock Currier
Crystals not pistols.



Edited 1 time(s). Last edit at 01/03/2009 04:47AM by Rock Currier.
avatar Re: Ruthenium
January 03, 2009 06:19AM
    
Dear Rock,
both photos are mine and in both locality errors present here:
Wallaga Province, Assosa Region, Turner River should be Tumet river,
Urals Region, Ekaterinburgskaya (Sverdlovskaya) Oblast', ysert' district, Neiva River should be Sysert' district.

I don't know, what I may to add to captions of these photos.

From 10 g of gold concentrate from Tumet I had select 9 grains of PGM minerals. Most of them had belong to Os-Ir-Ru ternary system - native iridium, osmium and ruthenium according to modern systematic of the group. Only two grains had contained Pt minerals minor inclusions - isoferroplatinum and sperrylite. Also one grain of irarsite was identified.
On local gold market in Qurah willage I'd observe ~15 g gold concentrate portion with two dozens of mirror-shining hexagonal xx of Os-Ir-Ru minerals up to 1-1.5 mm in association with some bright-green chromian silicates. Source of PGM in gold placers of middle flow of Tumet river is serpentinitized dunite body with significant chromite pod [www.mindat.org].

Probe from Neiva river was presented by PGM concentrate with very minor gold grains, and admixture of native tin, magnesioalumochromite, magnetite and zircon. From 22 analysed grains 3 was ruthenium, 6 iridium and other osmium-dominant. The largest Ru-dominant crystal which I met from the locality was 3.5 mm size and its surface was enriched with lead up to 22 % Pb. Unfortunately now this crystal is lost (after repair of 2006 in my lab I am unable to find many specimens...).

Pavel
avatar Re: Ruthenium
January 03, 2009 03:40PM
Dear Pavel,
Thanks so much for your additions. I took the liberty of rewriting them a bit and I hope I did not mangle your text too badly, but please read them over to make sure I didn't screw up. People viewing the pictures in the article, can now click on the captions and read the full captions below the large image. I made you the author and took my name out because I contributed so little to the articles.

Rock Currier
Crystals not pistols.
avatar Re: Ruthenium
January 16, 2009 08:34PM
Ricardo,
Thanks for your comment. Are the specimens linked in your email Ru dominate or is the material rutheniridosmine or are they rutheniridosmine but possibly ruthenium because they have not been tested? Where are these images located on mindat? I am reluctant to use images in the articles unless they have been uploaded to the official galleries because of copyright issues and I don't sometimes know who took the picture or in case I have questions about it. Also, if I use the link in your email I don't know how long the link will be good. For all I know they are all thrown out after a certain length of time. I need to find out about the images people attach to their messages.

Rock Currier
Crystals not pistols.
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