Mineralogically speaking this pair of dark blue balls perched on top of matrix is super interesting. It has great assets. This piece allows you to see the balls in context. One of the really interesting parts of this piece is the definition of the "rim" marking the transition between the chalcopyrite and the matrix. If you're a mineralogy nerd, you're going to love this piece. Read up on the scientific analysis of these at https://bit.ly/2MPR6Fi