It seems a bone. In few places covered with white stone.
There are some "blocks" a bit more white and shiny. There are cristals of quartz, put by cave people many thousands years ago.
Your can see bigger cristals. On the right, with black paint, little creature.
Two birds in the center. Made with different material. It seems to me, that the base of the artifacts is bone.
Two different kind of stone on the low edge, red and green.
"Face" of the creature, can see mouth, nose with 2 different material, eye, made with black paint in shape of a buck?
"Face", with eye made of 2 creatures.
Left edge. There, on the bright light, lot of sparklings.
These are sort of mosaik from colored peaces.