Pentagonite (rare)

Item Description

Pentagonite is the dimorph of Cavansite (calcium vanadium silicate), and the best-known specimens are those from the Wagholi Quarries in India. Although both minerals have the same chemistry, it's interesting to note that Pentagonite crystals have a true blue color to them, while Cavansite has a slightly greenish overtone. With that said, the finest examples of Pentagonite ever found are those from Wagholi. There have been a decent number of pieces found over the last few decades, but the species is still considered quite rare. It's one of those minerals that's almost exclusively tied to a single locality, as it's nearly impossible to find Pentagonites for sale from anywhere else. The species gets its name from the rare pseudosymmetrical pentagonal twins (five-fold) seen in certain crystals (one of the best examples I can find is at the following link: https://www.le-comptoir-geologique.com/pentagonite-en-twinned-pentagonite-ref-b20-02.html) This piece features a wonderful, intense neon blue color crystallized "spray" of Pentagonite measuring 1.3 cm across, on blades of silvery Heulandite on matrix. The incredible color of the Pentagonite combined with the fact that these are the finest example in the world makes it a very worthwhile specimen.