Dims: 3" x 1-1/8" x 1-1/4"
Wt: 2.34 oz
Morococala, Oruro Deposit, Bolivia
This crystal is one of the finer specimens of Vivianite that I've had the pleasure to see. It confuses me, though, because I cannot tell whether the crystal is doubly-terminated or if it is actually a base-to-base penetration twin! Needless to say, it is a single, four-sided monoclinic prism with terminations on each end. These terminations show noticeable damage but are well-formed. The prism faces are all clean with no damage, and show "termination faces" on two opposing sides. Its color is a deep green and is almost transparent in some spots, whereas other places are translucent to opaque. Its luster is vitreous, and it has a small amount of a metallic sulfide matrix attached to it near the center of the prism. There may be some siderite in the matrix rock, too!