Catalogue entry no. 546 by Max Loehr:
546 Plain Disk
Narrow, sharp-edged disk, similar to No. 545 but fashioned of a light greenish gray jade, with brown and yellow markings and extensive calcification.
A mineralogical test carried out by Cornelius S. Hurlbut, Jr., indicated that the material is mainly nephrite. The altered parts may also contain tremolite.