Diamond in Eclogite
This 3-mm diamond is in eclogite from the
Udachnaya Mine, Republic of Sakha
(Former Soviet Union). Click on image for larger photo.
Note the naturally occurring etch pits on the surface.

Small octahedral diamond
from Lake Ellen, Upper Peninsula of Michigan.
(Click on image for 24-bit image).)

Compare the diamond and graphite crystal strucures.

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