For 10 points, name this clastic rock composed of angular fragments.
When composed of variegated marble, it is known as pavonazzetto, and is an example of the collapse type common in karst topography.  When similar material is formed under metamorphic conditions, it is instead known as (*) cataclasite.   One type is generated in impact cratering events, and often includes shocked quartz in its composition.  Diatremes are volcanic pipes which have filled with this rock which is often formed during violent hydrothermal events.  Their usually rapid formation prevents their clasts from undergoing the weathering characteristic of conglomerate clasts.  For 10 points, name this clastic rock composed of angular fragments.
When composed of variegated marble, it is known as pavonazzetto, and is an example of the collapse type common in karst topography.  
{breccia} (4) [AU]