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Mineable reserves of sillimanite upto a depth of 30 meters are estimated at 10 million tonnes, out of which 1 million tonnes (proved reserves) occur over a strike length of km having % Al 2 O 3, % Fe 2 O 3 and % silica (the value of Al 2 O 3 increase by 10% after individual sillimanite crystals are analysed separately).