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.