Suevite (or suevite breccia)

A suevite breccia is a polymictic impact breccia with clastic matrix that contains shocked and unshocked clasts and cogenetic melt particles (glassy or crystallized).

Suevite breccias from the Rochechouart (France) impact structure. Red Montoume and green Chassenon variety.

Suevite breccia, Azuara impact structure (Spain).

More suevite breccias are shown on

http://www.impact-structures.com/suevite/the_suevite_page.htm

 

Not an impact breccia: impact melt rock    

Impact melt rock (granophyre), Vredefort impact structure (South Africa).

Although macroscopically very similar to polymictic impact breccias, the term "impact melt breccia" should be avoided. Different from a breccia which by definition has a clastic matrix, an impact melt rock has a matrix solidified from a melt (glassy or crystallized). Also see: http://www.impact-structures.com/melt/impactmeltpage.html