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Content: It has an inner
         dentin layer (which has a high mineral content; it forms as the tusk grows, and leaves a marbled look on finished objects),
         an outer dentin layer, and a smooth, dense cementum layer. Walrus ivory is used primarily for small objects. 4. Sperm Whale Ivory
Thirty teeth of the sperm whale can be used
         for ivory. Each of these teeth, up to 8" long and 3" across, are hollow for the first half of their length. Sperm
         whale ivory is easily confused with walrus ivory, as both have two distinct layers. The inner layer of sperm whale ivory,
         however, is much larger. As well, in a longitudinal section, sperm whale dentin has yellow "globules" included in
         the marbilization. 5.