This hard rock contains sand-sized grains of quartz. fractures cut across, not around the sand grains. what is the correct name for this rock?

The hard rock that contains sand-sized grains of quartz. fractures cut across, not around the sand grains is called schist. Schist is a medium-grade metamorphic rock with more than 50% platy and elongated minerals, like quartz and feldspar. 
It can be found in many countries including Brazil, parts of the US and Ireland.

Freshwater ecosystems

  the fraser river is known for the fishing of the white sturgeon.(trout)