Any wood that has a density greater than that of water (1 g/cm^3) will sink. Some of the many woods that will sink include Cocobolo, Coralwood, Ebony, Eucalyptus Mahogany (New South Wales), Gaboon, Greenheart (British Guiana), Grenadilla (Mpingo), Ironwood (black), Lignum Vitae, Satinwood (Ceylon), and Water gum.
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