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Contact SupplierBorax "pentahydrate" has the formula Na 2B 4O 7·5H2O, which is actually a trihydrate Na 2B 4O 5(OH) 4·3H2O. It is a colorless solid with a density of 1.880 kg/m3 that crystallizes from water solutions above 60.8 °C in the rhombohedral crystal system. It occurs naturally as the mineral tinkhanite.

