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Mineralogical ClassificationTantal/Tantalcarbid
20th May 2012 16:24 UTCKnut Eldjarn 🌟 Manager
Knut
20th May 2012 21:54 UTCUwe Kolitsch Manager
21st May 2012 10:07 UTCjacques jedwab
-the date of a publication (before or after the recognition of the Uralian material as a carbide and not as a metallic element);
-the date of the finding by Novgorodova et al. that the Uralian mineral is a solid solution of Nb and Ta carbides;
-the recognition and naming by Novgorodova et al. of jedwabite Fe7(Nb,Ta)3;
-the ascertainment that later authors were aware of these oddities and confusing possibilities;
-the scarcity of reference materials.
I think that the next step should be a careful (re)examination of the materials determined in recent times as metallic tantalum or tantal , taking the above remarks and possibilities into account.
Frankly speaking, I am not very happy with the situation, but the scientific aspects at stake are interesting, especially if one takes into account the existence of other carbides on earth (khamrabaevite, V-carbide from oceanic smoker).
J.J.
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