Vibrant Blue Cavansite on Stilbite from India - Extint...

Example with captivating Cavansite spheres on Stilbite matrix — This specimen of notable mineralogical interest presents a rare and fascinating association of Cavansite and Stilbite, hydrated calcium and vanadium silicate minerals and aluminum silicate respectively. The crystal formation develops on a basaltic matrix typical of the Deccan Traps, a geologic region renowned for its exceptional zeolitic mineralization. Cavansite manifests in spherulitic aggregates, while Stilbite forms distinct tabular crystals that contribute to a complex and visually rich texture. Color-wise, the specimen is dominated by the pearly white and milky tones of Stilbite crystals, which exhibit a vitreous-to-pearly luster and good transparency in some areas. In clear contrast and with harmonious distribution, the Cavansite spheres emerge, characterized by an intense bright blue-green color, often described as 'peacock blue' or 'ocean blue', standing vividly against the lighter background. The matrix consists of porous basaltic rock, ochre-brown in color, providing solid support and authentic geological context to the mineral association. The provenance of this lot is Maharashtra, India, a classic and premier locality for zeolitic minerals and related species. The volcanic formations of the Deccan Traps have created geodes rich in hydrothermal solutions, ideal for the precipitation of minerals like Cavansite and Stilbite. Cavansite crystallization often occurred in stages following Stilbite, forming encrustations or nuclei on it, as seen in this piece. The aesthetics of this specimen are excellent, with uniform coverage and good density of Stilbite and Cavansite crystals distributed on the surface. The Cavansite spherules are well-formed and retain their distinctive color, while the Stilbite crystals are intact and display their typical grain‑to‑granular or tabular crystal habits. The overall composition of the piece is balanced and provides a striking visual impact for any collector. The preservation state is classifiable as good, with the main crystals well preserved. Minor imperfections or detachments are minimal and consistent with the fragile nature of these minerals and the mining methods. The specimen is suitable for display in a mineral cabinet, highlighting its intrinsic beauty and rarity. It is not mounted on an artificial base, allowing full appreciation of its natural form. This specific lot represents an opportunity to acquire a classic Cavansite and Stilbite specimen from India, a highly sought-after association in mineral collecting. The combination of vivid colors, the clear definition of crystal forms, and provenance from a reference locality make it a desirable piece for both experienced collectors and enthusiasts seeking iconic specimens.

Stima:€250

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