“SEM image of rounded native Tantalum grain crushed out Neptunite (dark-grey phase at the right side) crystal. Specimen of this neptunite was collected by Igor V. Pekov in 1994 (author's number 'T-30'). Pavel M. Kartashov collection, analytical data and photo.”

“ED spectrum of native Tantalum grain from previous image. As we can see, this Tantalum is very pure and don't contain oxigen or carbon (i.e. it isn't tantalcarbide or tantite). Pavel M. Kartashov collection, analytical data and photo.”