Associations to the word «Greywacke»
Noun
Adjective
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Wiktionary
GREYWACKE, noun. (geology) A hard dark sandstone with poorly sorted angular grains of quartz, feldspar, and small rock fragments in a compact, clay-fine matrix.
Wise words
Four things come not back. The spoken word, the sped arrow,
the past life, ad the neglected opportunity.