Which of the following is not a metamorphic rock? by Sunday | Jun 13 | Geography WAEC | 0 comments A. slate B. marble C. loess D. gneiss Correct Answer: Option C – loess Users Also Read These:Marble is a metamorphic rock formed from?All the following rocks are metamorphic except?The formation of metamorphic rocks normally involves…Which if the following minerals is most likely to be…Gneiss is a metamorphic rock formed from?