Wood hardness is often measured by the Janka scale and sometimes specific gravity (heaviness). In the USA Osage-orange, Maclura pomifera, at 2,100 on the Janka scale, and Mesquite, Prosopis spp, such as honey mesquite, Prosopis glandulosa, at 2,345, are among the most common hard American woods. The hardest woods appear to grow in the tropics, and the American variety of lignum vitae, Guaiacum sanctum or holywood, at Janka 4,400 is found in Florida and the Bahamas Read more: What Type of Wood Is the Hardest? http://www.ehow.com/info_8203497_type-wood-hardest.html#ixzz1kK0Dss4O
Lignum vitae has one of the hardest woods in the world. It is part of a group of flowering tree species known as “ironwoods”. They are named so because they have little or no air spaces between cells. In addition these cells are extraordinarily heavy due to the density of cellulose and lignin in their cell walls.
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