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greywacke wis ditetepake minangka rock sandstone coarse-grained peteng kang ngandhut sen lempung luwih saka 15 saben
saka grauwacke german, saka grau grey + wacke
rock grained nggoleki, rock opaque
gritstone utawa grit punika hard, coarse-grained, siliceous sandstone
rock grained coarse, rock opaque