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Noun: greywacke
  1. Hard dark-coloured sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix
    - graywacke [N. Amer]

Encyclopedia: Greywacke

Nearest

greyish-green
greyish-pink
greyish-white
greylag
greylag goose
grey-leaf pine
greyly
greyness
grey-pink
greyscale
greywacke
grey-white
Grias
Grias cauliflora
gribble
grid
grid metal
griddle
griddlecake
gridiron
gridiron-tailed lizard