Kimberlite (rare! circa early 1900s) ex. Foote

Item Description

This chunk of kimberlite is a VERY RARE representative of the much denser "blue earth" that miners had to excavate from a diamondiferous pipe. If desired, this chunk of kimberlite could be crushed with the hope of finding a gem diamond in its interior. Attached is an old Foote Company label from the early 1900s! Value ? I have not had a documented example of this material for sale but once in my past.