Deep Blue Cavansite on Heulandite. This perfectly positioned, deep blue and well formed round crystal of Cavansite is among the darker blues we have ever seen. A richly saturated fine mineral specimen, perfectly contrasting the white, gemmy Heulandite supporting it. A matrix of basalt completes the piece. he Wagholi Quarry of Pune, Maharashtra, India was the only mine where large, lustrous crystals of this type have been found. This legendary location has been both closed and overbuilt, making these rare crystals increasingly hard to find. A perfect small cabinet fine mineral. 1.5" x 1" x.75", .3 oz.