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India

India is one of the world's most prolific mineral-producing countries, celebrated above all for the extraordinary zeolites and secondary minerals of the Deccan Traps, a vast flood-basalt province in Maharashtra that ranks among the largest volcanic features on Earth, formed some 60 to 70 million years ago. Amygdaloidal cavities in these lava flows have yielded, since large-scale quarrying began in the 1970s, an unmatched abundance of fine specimens: emerald-green apophyllite with mesolite from the Poona (Pune) region, velvety white okenite from Mumbai, gemmy water-clear apophyllite from Jalgaon, golden powellite from Nashik, and the intensely blue cavansite of Wagholi. The Nashik District, including the famed Pandulane and Aurora quarries on Pandulena Hill, is legendary for salmon-pink to deep-red stilbite bow-ties and sheaves associated with heulandite, laumontite, scolecite, mordenite, amethyst quartz and chalcedony, while quarries near Pashan and Sakur add further variety among the roughly two hundred zeolite-group species recognized worldwide.

Beyond the basalt provinces, India's ancient Precambrian shield and Himalayan pegmatite belts host a remarkable range of gem and collector minerals. Rajasthan's Aravalli range, between Udaipur and Ajmer, produces emerald, aquamarine, tourmaline and hessonite garnet from pegmatites cutting Archaean schists, while similar pegmatites in Karnataka, Odisha and Tamil Nadu yield fine beryl, and Andhra Pradesh's Eastern Ghats Mobile Belt is a source of gem-quality chrysoberyl, iolite, zircon, spinel and kyanite. Historically, the Golconda mines of south-central India furnished some of the most famous diamonds ever unearthed, underscoring the country's centuries-old reputation as a source of exceptional gem rough. Sapphire occurs in syenite-pegmatite contacts of Jammu and Kashmir's Doda district, and moonstone deposits enrich Tamil Nadu.

For mineral collectors, India is above all synonymous with the Deccan zeolite suite — a combination of scale, quality and diversity rarely matched by any other locality, with specimens of stilbite, apophyllite, cavansite and okenite from Maharashtra now anchoring collections worldwide. Add to this the pegmatite gem minerals of Rajasthan and the Eastern Ghats, and India offers an unusually broad and scientifically important range of natural mineral specimens, from classic zeolite pockets to historic gem-bearing pegmatites, making the country a perennial favorite among systematic and aesthetic collectors alike.