Stilbite
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Stilbite from the Nasik District, Maharashtra, India, measuring 73 × 55 × 58 mm and weighing 250 grams. A good bulky piece of one of the Deccan Traps' most familiar zeolites.
Stilbite is a calcium-sodium zeolite, forming its distinctive sheaf-like or 'bow-tie' aggregates of tabular, pearly crystals, and it developed from late-stage, low-temperature fluids filling gas cavities in the Deccan Traps flood basalts erupted across much of western India around 66 million years ago. Nasik, alongside the better-known Poona and Jalgaon districts, is one of the classic sources of this material, which has made Maharashtra one of the most widely collected basalt-mineral provinces anywhere.
A good weighty Stilbite like this is a solid, affordable way to represent one of the Deccan Traps' most recognisable species. This piece is from the David Vince Collection.