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Star of India. The Star of India is a 563.35-carat (112.67 g) star sapphire, one of the largest such gems in the world. [1] [a] It is almost flawless and is unusual in that it has stars on both sides of the stone. The greyish-blue gem was mined in Sri Lanka [3] and is housed in the American Museum of Natural History in New York City.
This lists of mines in India is subsidiary to the list of mines article, and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marbles and other quarries may be included in this list. In India, the underground mine to surface mine ratio is 20:80 [citation needed].
The sapphire deposits of Kashmir are well known in the gem industry, although their peak production took place in a relatively short period at the end of the nineteenth and early twentieth centuries. [ 5 ] : 463–482 These deposits are located in the Paddar Valley of the Jammu region of Jammu and Kashmir in India. [ 36 ]
Ruspoli Sapphire: 136.9 carats (27.38 g) [11] Stuart Sapphire: Sri Lanka 104 carats (20.8 g) Blue Tower of London [12] Bismarck Sapphire: Myanmar: 98.56 carats (19.712 g) Table Blue National Museum of Natural History, Washington [13] James J. Hill Sapphire: 22.66 carats (4.532 g) Cornflower National Museum of Natural History, Washington [14]
As of 2012, India is the largest producer of sheet mica, 2015 the fourth largest producer of iron ore, alumina, chromite, and bauxite in the world. A coal and iron ore project is in the fifth largest reserve in world. India's metal and mining industry was estimated to be $106.4 billion in 2010. [2] Mining in India has been prominent since ...
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Rampura Agucha is a zinc-lead sulfide deposit that is located in the Sikar belt which is part of the Aravalli-Delhi orogen. [4] [5] The Bhilwara belt is mostly metasedimentary, metamorphosed dolomite and a small amount of igneous rocks. [5] [6] The deposit was originally a sedimentary exhalative deposit before experiencing a metamorphic event. [2]
Several articles, including the Journal of Gemmology state that gold sheen sapphire is high in iron and titanium oxide. [2] It has inclusions of ilmenite, hematite (gold color) [5] and magnetite (black). It exhibits asterism and hexagonal growth, [6] a lack of UV fluorescence, healed fractures and polysynthetic twinning (parallel lines). Golden ...