Ivory is a hard, white material from the tusks and teeth of animals. |
Elephant ivory is the most important source, but ivory from mammoth, walrus, hippopotamus, sperm whale,
killer whale, narwhal and wart hog are used as well.
A bone is a rigid organ that constitutes part of the vertebral skeleton.
Note that many ancient dice are NOT numbered in the standard (1-6, 2-5, 3-4) way.