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Frank Keutsch's Blog

New Analyical Results

23rd Dec 2007

I will start posting the outcome of my analytical results of specimens I acquire. I do this to the best of my abilities but I don't guarantee they are representative of similar material other Mindat members might have acquired (these over the last 1.5 years):

Today I analyzed with SEM/EDS (none in polished section today, so mixtures are hard to ID, and also not quantitative-I mainly look to make sure the right elements are in it):

Herzenbergite with Berndtite from the Sorachi vein, Toyoha Mine:
Interesting one I found seems to be a slightly lead rich teallite, unless it is herzenbergite intergrown with galena, but that does not match the description I got.

Benavidesite with Zinkenite from the Tohya Mine:
I found the Zinkenite but could not locate any Benavidesite, but I found an interesting Pb-Ag-Sb-S mineral...

Rucklidgeite supposedly 3mm with gold from Alekseevskoye Mine:
I found gold, but other than that only stibnite.

Frohbergite Kawazu Mine, supposedly 1 mm veins:
I found Te, Au-Te minerals and no trace of a Fe-Te mineral. I am not saying it is not in there somewhere, but I can't find it easily. Certainly seems like mainly Te with a little Au-Te...

Telluronevskite:
My semiquantitative analysis gives: Bi3TeSe2 so at least very close, although I probably can't distinguish it from:

Vihorlatite:
My analysis is similar to the telluronevskite, which could be OK...

Kirkiite, Agios Philippos Deposit with bismuthinite:
My analysis did not give correct stoichiometry but correct elements, so a third possible success.

Fettelite from Imiter:
my specimen turns out to be Pearceite, or what used to be called Arsenopolybasite.

Vaesite from Zaire:
Rather unremarkable Carrollite xx...

Germanite from (I forget) somewhere in N-Africa:
Fe-Oxides...

Gudmundite xx from the US:
Perfect match...

Mummeite xx from the Alaska mine:
match (at least as far as my method goes).

Success ratio is about average.

Again, perhaps the other rare minerals are there, too, but certainly not according to the description of the specimens and not easy to find...




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Comments

Thank you very much, Frank, for sharing these interesting results. My friend Kotaro Watanabe once said that the happiest systematik collectors were those who never analyzed anything, as they would always believe their labels. The converse of this must be that the UNhappiest systematik collectors are those with access to a SEM !

Alfredo Petrov
23rd Dec 2007 9:48pm
So very true.....a "success" rat of 50% or more is to be envied....

Tony Nikischer
27th Dec 2007 4:08pm

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