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n-. A coarse sandstone or fine-grained conglomerate that is composed of subangular to rounded fragments of quartz, feldspars, and bits of other dark-colored minerals or rocks firmly cemented.

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Usage examples (16)
  • It led up stairs of graywacke, along the brink of slaty cliffs that dropped sheer, hundreds of feet to the stream below.
  • Ecoregion 66c is underlain by Precambrian metamorphic rock, including quartzite, graywacke, and conglomerate of the Lynchburg Formation.
  • It wasn't made of plastic, but exquisitely carved out of graywacke, the same stone as used for the Narmer Palette, which is similar to slate but has a finer grain.
  • A fragment of an exquisitely carved graywacke vase proved there had been a royal presence -- such stone vessels were products of royal workshops in the early First Dynasty.
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