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NORTHWOODS ENGLISH JACKS IVORY and EXTERIOR MAMMOTH IVORY
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VAN REENEN IVORY
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Just so I don't bore anyone...a condensed version of what Ivory is...
Ivory tusks and teeth consist of an inner pulp cavity surrounded by dentine. Dentine is a combination of mineralized connective tissues and collagen proteins. An external bony layer called cementum, commonly called bark or rind, covers the dentine. Most tusks and teeth have an additional external enamel layer covering the cementum, but young elephants and walruses only have enamel on the very tips of their tusks. Their enamel is quickly worn away and it is not replaced. Dentine is the main component in ivory and it is this layer that is utilized for carvings, inlays, etc.
Ivory forms in layers upon layers like placing a cone on top of a cone.
Over time these layers form a pattern of concentric growth rings similar to growth rings in trees. If you make a cross-section in ivory you will see these lines, called "Lines of Owen."