What is the name of the hardest known wood?

Kokabola also known as purple heart.
i dont know really but i'd say it must be teak or mahogany
Snakewood {Piratinera guianensis}.
Brazilian Walnut: the hardest wood flooring
Lignum Vitae: the hardest commercial wood.
There is a tree that supposedly grows on Vancouver Island, called the Arbutus. If one was to be cut down for whatever reason, it would have to be cut up within twenty minutes or else the wood would become as hard as steel.
Dalbergia Sissoo (Botanical Name), other name Indian Rosewood Tree Tahali is also another a name
Bois d'arc is supposed to be one one the hardest woods. Translates to Wood of the Arc. So named because some say that the Arc was made from the wood of this tree.
I think I saw something on The Discovery Channel about a wood so hard it's called IRONWOOD. That's all I remember.
Lignum Vitae is considered the hardest commercial wood. With a hardness of 4500 it is roughly three and a half times as hard as red oak. This wood is not only extremely hard, but it is also extremely heavy, with a specific gravity over 1.0 it will sink in water.
5. The World's Hardest & Heaviest Wood

Most of the other remarkable plant records go to the flowering plants. This is not surprising since flowering plants have colonized practically every conceivable habitat on earth, from vast submarine meadows in oceans and bays to arid deserts and windswept alpine summits. At least a dozen species of flowering trees called "ironwoods" hold the title of world's heaviest wood. Wood is composed of dead cells of a tree trunk, particularly the inner xylem tissue when the bark is removed. The weight of wood is essentially due to the cellulose and lignin in the cell walls of billions of cells. Ironwoods all have wood with very dense, heavily lignified cells with little or no air spaces in the cell cavities (lumens). The pure cell wall material has a specific gravity of about 1.5, and the heaviest and hardest ironwoods approach 1.4. Since pure water has a specific gravity of 1.0, ironwoods with specific gravities greater than 1.0 will sink in water. Certainly one of the world's heaviest and hardest ironwoods is the Caribbean tree called lignum vitae (Guaiacum officinale), with a specific gravity of 1.37. The name lignum vitae means "wood of life," owing to the medicinal properties of the sweet-smelling resin. The density and high resin content of the wood make it extremely resistant to friction and abrasion and account for its remarkable self-lubrication properties. Under certain conditions it actually wears better than iron. In fact, the highly-prized wood was used for end grain thrust blocks which lined the propeller shafts of steamships. [Note: The Guinness Book of World Records lists the South African black ironwood (Olea laurifolia) as the heaviest wood with a specific gravity of 1.49. This is rather doubtful since the specific gravity of pure cell wall material is 1.5 (i.e. without any cellular structure), and samples of Olea laurifolia I have tested only weighed in at about 1.11.] By way of contrast, cork bark from the European cork oak (Quercus suber) has a specific gravity of 0.24; and the tropical American balsawood tree (Ochroma pyramidale) is one of the world's softest and lightest woods with a specific gravity of only 0.19.

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