pune india

Pentagonite with Cavansite on Stilbite - Wagholi Quarries, Wagholi, Pune District, Maharashtra, India

Pentagonite is the rare (very much so) dimorph of Cavansite. This means that they are the same chemistry but are actually different crystal forms, and thus different species. As rare as pentagonite is (the first Indian specimens were only found many years after the first cavansites), it is even more incredibly rare to find the two species in close association as on this piece.