Contributed by collector no. 4
Vanadium group: olive-green tarnished Vanadium chunks, Niobium chunks, and Tantalum chunks
Contributed by collector no. 3
The Vanadium metal group: Vanadium , Niobium , and Tantalum
A small polished Tantalum bar. The bar is slightly curved, and shows a gorgeous pattern on its surface which is a window into the internal crystal growth of this sample.
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