"The genus is famous as the supplier of Lignum vitae , which is the heartwood of several species in the genus. It is the hardest wood that is measured using the Janka hardness test , requiring a force of 4,500 lb f (20,000 N) to embed a steel ball 0.444 in (1.13 cm) in diameter a distance half of that into the wood."
Guaiacum is widely known for cure diseases also called Verawood. Is also a heavy wood,when it dry completely, its specific gravity 1.3. Surface have white crystal, wood will show green.