The MAT-76 is a large circular Romanian minimum metal anti-tank blast mine.
The mine is actually a cast block of TNT with a thin coating of fibreglass.
The bakelite plastic used in the fuze of a MAT-76 may become brittle in desert conditions, which can reduce the activation pressure.
This may make the mine unstable i.e. can detonate simply by handling it.
The mine is found in Angola, Iraq, Kuwait, Liberia, Mozambique, and Zambia.